Category: A Level Physics Chapters

The Higgs boson particle – digested

The Higgs boson particle – digested

https://www.gu.com/p/3jcq6

The Higgs boson particle – digested
The secret of life and the universe, explained by our science editor

An experimental result in the search for the Higgs boson particle, released by Cern.

In the aftermath of the big bang that flung the universe into existence 13.82bn years ago, the forces of nature were one. But as the universe expanded and cooled, they separated out into the four seen today. The electromagnetic force, which is carried by photons, allows you to see, and stops you falling through your chair.

The strong force holds atomic nuclei together. The weak force goes to work in the sun and helps to make it shine. Then there is gravity, which is not really a force at all, but that is for another time.

One trillionth of a second after the big bang, an invisible field that spread throughout space switched on. This Higgs field wrenched two intertwined forces apart – the weak force and the electromagnetic force. How? By making the particles that carry the weak force heavy, while leaving the photon weightless.

The weak force travels less than the width of an atom, but the electromagnetic force ranges over an infinite distance.

The Higgs field gives mass to other particles too, such as quarks and electrons, the building blocks of atoms. The Higgs boson comes with the field, a subatomic smoking gun that proves the field is there.

Permanent link to this article: https://www.animatedscience.co.uk/2013/the-higgs-boson-particle-digested

How to write a personal statement for history

How to write a personal ucas statement for history

https://www.gu.com/p/3hddy

History is the tenth most popular subject to study at degree level in the UK, and with many universities forgoing candidate interviews, your personal statement is the most important way to make yourself stand out. The competition is fierce (the top universities require grades of A*AA), and a muddled or mediocre statement will harm your application.

So how can would-be historians impress application tutors? Dr Elizabeth Tingle, of Plymouth University, wants the statement to reflect the candidate who wrote it. She says: “When we talk about originality inpersonal statements, we really mean individuality.”

Southampton University’s Dr McHugh agrees that many applications are “too generic and vague. We want to get a sense of who you are as an individual, and what kind of student you would be.”

This individuality should not be achieved through wild or outrageous methods; your statement doesn’t need to be written in old English, or abstractly represent the consciousness of Thomas Cromwell. If you do something outrageously different, there’s probably a reason why no one’s done it before.

Instead, a personal statement should show something of you as a person, and convey your own unique engagement with history. Dr Ryrie, historian of religion at Durham says:

“The kind of personal statement that warms an admissions tutor’s heart is the kind which is honest: which describes, in genuinely personal terms, quite why the student loves the subject, and conveys something of their passion for it”.

‘Passion’, however, is a controversial word. UCL’s Dr Jason Peacey complained that “it gets a bit tiring reading hundreds of forms where the student proclaims that they have a ‘passion’ for history”.

Dr Ansari, head of history at Royal Holloway, agrees, and wants “genuine expressions of interest in history, but not in terms of ‘I am passionate about…’. Simply wanting something strongly is not enough”.

You need to convince admissions tutors that you have the intelligence and academic ability needed to successfully undertake a degree in the subject.

Dr Peacey says: “Students don’t always do enough to explain what it is about history that interests them, why this interest can only be met by undertaking more study at a higher level, and what should make me think that they have the potential and ability to study at this level”.

The same sentiments are also mentioned by Dr McGladdery, admissions officer at St Andrews. “Studying and writing about what happened in the past has little purpose if students cannot develop the skill of critical evaluation. Historiographical awareness is very important, as is the ability to present an opinion supported with evidence and cogent analysis.”

Students who show that they have considered the subject in relation to other academic avenues are likely to impress. As Dr Gadja, of Oxford university, says:

“Historians like to take insight from a huge range of perspectives, so we are always delighted when students can demonstrate how their interest and ability at foreign languages, philosophy, or political thought, literature, and so on, might intersect with their historical interests, and be of use in their development as historians”.

A clear, competent analysis of the ways in which your different subjects interact, and how this has aided your ability as a history student, can be a valuable inclusion in your personal statement.

Dr Gadja says that it is important to mention extra-curriculur interests. For Gadja, an interest in visiting museums, going to public lectures, and anything that shows an interest in history beyond the demands of one’s A-level course, would be relevant.

If you have had any relevant work experience, do mention it, but it must have had a definite impact on your approach to thinking about history. If you haven’t managed to gain experience in a historical field, though, don’t worry too much.

Gadja says: “we certainly don’t look for relevant work experience when making decisions – most applicants will not have had the fortunate opportunity to work in jobs relating to the heritage industry or similar, and that doesn’t put them at a disadvantage at all”.

Mention of non-academic areas in which you are wonderfully talented should be limited to a couple of sentences at most, and should always be linked back to the ways in which they have contributed to your academic or personal development; such as by improving time-management, or organisational skills.

Dr Simon Smith, of Oxford University, say: “Unlike some US universities or colleges, UK universities are not seeking to admit quotas of musicians, sports people, or thespians.”

It is important to write the statement in clear, concise prose, avoiding the use of formulaic words or phrases. Dr Peacey says:

“If I had a pound for every time I had been told that history is important because, as George Santayana said, those who fail to understand the mistakes of the past will merely repeat them… then I would be a rich man indeed.”

Try and avoid stilted references to the “eternal value” and “enduring fascination” of the past. Far more impressive is to explain and analyse what it is that makes you so interested in history, and specific areas in particular.

Above all, you should engage with the concepts that you are discussing, rather than just stating them. As Dr Ryrie says:

“Make us feel that you are a person of vision and imagination, for whom your outstanding A-level performance is just the beginning.”

Avoid anything bland or dull, and make the personal statement a reflection of your individual talents and interests. You want your statement to be different and engaging, otherwise it will slip through admissions tutors’ fingers without leaving a mark.

Permanent link to this article: https://www.animatedscience.co.uk/2013/how-to-write-a-personal-statement-for-history

Blu-Ray albums target hi-fi fans

Blu-Ray albums target hi-fi fans https://www.bbc.co.uk/news/entertainment-arts-24441979

Permanent link to this article: https://www.animatedscience.co.uk/2013/blu-ray-albums-target-hi-fi-fans

New Scientist: Leaky microwaves can power your kitchen gadgets

New Scientist: Leaky microwaves can power your kitchen gadgets. https://www.google.com/producer/s/CBIw2ZG3tQI

Permanent link to this article: https://www.animatedscience.co.uk/2013/new-scientist-leaky-microwaves-can-power-your-kitchen-gadgets

T2K neutrino experiment – Super Kamiokande!

T2K neutrino experiment reports new oscillation results

https://www.gu.com/p/3hdyb

 

Ben Still, who works on the T2K neutrino experiment in Japan, describes the new result they have reported today at the European Physical Society meeting in Stockholm..

T2K overview

For the first time ever the ghosts of the particle world, neutrinos, have been explicitly seen to actively change personality. Results presented today by the Tokai to Kamioka (T2K) experiment fills in previously unseen parts of the picture of how our universe works at the smallest scales, but it also raises some interesting questions.

Neutrino particles are ghostly, difficult to see, particles that have real personality issues. They come in three types, known as flavours: electron (νe), muon (νμ) and tau (ντ) neutrinos. The first neutrino experiments used naturally occurring sources of the particles, such as the Sun (electron neutrinos) and cosmic ray particle showers (muon neutrinos), to understand more about how they interacted with the world around them. They seemed to be misbehaving according to either experiment or theory as fewer neutrinos were seen than were predicted. For years neutrinos in nature seemed to be disappearing between being created and then detected in many various experiments that looked for them. After almost 30 years of experimentation all was finally resolved. It was proven that naturally occurring neutrinos were not disappearing, but instead were changing into other types of neutrino which could not be seen, due to having too low an energy.

Beams have now been engineered to further investigate this bizarre characteristic now known as oscillation. These beams are specifically muon-type neutrinos because physicists copied cosmic ray particle showers in nature. Experiments saw the muon-type neutrinos disappearing as expected from natural observation. Because of the disappearance they were assumed to be changing into tau-type neutrinos, which did not have enough energy to produce a tau particle and be directly seen.

For the first time neutrinos have actively been seen to change from one flavour to another rather than just viewing a disappearance. The T2K experiment has seen muon neutrinos change character to become electron neutrinos after a journey of 295km across Japan. The certainty of this measurement is quoted as 7.5 standard deviations from zero or to put in terms of percentage over 99.9999999999936% sure that the appearance is occurring.

T2K neutrino eventHistory has shown us that the more we understand about neutrinos the more secrets of nature they uncover. The observation made by T2K opens up a whole new way of observing neutrinos. As we continue to piece together the character of the neutrinos we hope to continue uncovering more bizarre secrets; they may even be the key to how the raw material for the Universe was first created.


Ben Still is a particle physicist at Queen Mary, University of London

More information on the EPS HEP meeting is here, and further details of the presentation can be found here.

Permanent link to this article: https://www.animatedscience.co.uk/2013/t2k-neutrino-experiment-reports-new-oscillation-results

What are Maxwell’s Equations?

What are Maxwell’s Equations?

https://www.gu.com/p/3tm39

Permanent link to this article: https://www.animatedscience.co.uk/2013/what-are-maxwells-equations

French physicist Léon Foucault celebrated in Google doodle

French physicist Léon Foucault celebrated in Google doodle

https://www.gu.com/p/3tp7b

Permanent link to this article: https://www.animatedscience.co.uk/2013/french-physicist-leon-foucault-celebrated-in-google-doodle

Nuclear plants ‘no cancer risk’

Nuclear plants’ no cancer risk

https://www.bbc.co.uk/news/health-24063286

 

Child with leukaemia receiving hospital treatmentLeukaemia accounts for around a third of childhood cancers

Children living near nuclear power plants do not have an increased risk of developing leukaemia, a study says.

Experts looked at data on 10,000 children diagnosed under five between 1962 and 2007, and where they lived.

The British Journal of Cancer study is not the first to rule out a link – but previous studies’ methods were challenged.

Cancer Research UK said the results were “heartening” but added monitoring should continue.

Leukaemia is the twelfth most common cancer in the UK, but accounts for a third of all cancers diagnosed in children.

Around 500 new cases were diagnosed in children under the age of 15 in 2010 in the UK.

Concern over a link between nuclear power plants and childhood cancers was triggered in the early 1980s when a TV investigation reported a higher number of cases among children living near the Sellafield plant in Cumbria.

Since then, there have been conflicting reports from studies in the UK and the rest of Europe as to whether there is a link.

Some anti-nuclear groups have criticised the way previous studies have been carried out.

They point to a German study which suggested there could be a link.

In this latest study, carried out using the same method as the German one, experts from the Childhood Cancer Research Group in Oxford looked at data on almost 10,000 children who were diagnosed with leukaemia or similar cancers in Britain between 1962 and 2007 when aged five or under.

“The incidence of childhood leukaemia near nuclear installations in Great Britain has been a concern ever since the 1980s” Dr John Bithell,Childhood Cancer Research Group

The data was taken from the National Registry of Childhood Tumours, which has kept records on nearly all children diagnosed with cancer since 1962 and which is linked to birth records for children born in Britain.

They looked at where these children were born and where they lived when they were diagnosed.

They also compared the information with data on more than 16,000 children with different cancers.

The study found there was no apparent increased risk of developing childhood leukaemia or non-Hodgkin lymphoma among children living near nuclear power plants.

Dr John Bithell, honorary research fellow at the Childhood Cancer Research Group who led the study, said: “The incidence of childhood leukaemia near nuclear installations in Great Britain has been a concern ever since the 1980s when an excess of cancer in young people near Sellafield was reported in a television programme.

“Since then, there have been conflicting reports in the UK and Europe as to whether there is an increased incidence of childhood cancer near nuclear power plants.

“Our case-control study has considered the birth records for nearly every case of childhood leukaemia born in Britain and, reassuringly, has found no such correlation with proximity to nuclear power plants.”

Cancer Research UK said the study did support previous findings, but said its small numbers and the fact it did not look at plants which carried out other work such as fuel processing – plus the finding of an increased risk in the German study – meant more work was needed.

Hazel Nunn, head of health information, said: “It’s heartening that this study supports the findings of the Committee on Medical Aspects of Radiation in the Environment (COMARE), that being born or living near a nuclear power station doesn’t lead to more cases of leukaemia and similar cancers in children under five in the UK.

“But these results can’t rule out any possible risk, so it’s still important that we continue to monitor both radiation levels near nuclear power plants and rates of cancer among people who live close by.

Permanent link to this article: https://www.animatedscience.co.uk/2013/nuclear-plants-no-cancer-risk

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