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Physics : Recent Questions and Answers (Page 259)

Find answers to your questions about Physics or help others by answering their Physics questions.

Doubt on the predictions on the photoelectric effect according to the wave theory of classical physics

I read in some texts that classical physics predicted the following in the photoelectric effect,KE of electrons ejected is directly proportional to intensity oflightIncreasing the frequency would increase...

Asked on 06/15/2021 by Lumbini A Tambat

2 answer

Uncertainty in parenthesis

In a physics text book I read the following:$$e/m=1.758820150(44) ×10^{11} mathrm{C/kg} $$ In this expression, $(44)$ indicates the likely uncertainty in the last two digits, $50$.How should I...

Asked on 06/15/2021

2 answer

Will I standing on earth get electrocuted when only touching one end of a floating high-voltage generator?

Consider the following thought experiment. There is a floating generator that produces high voltage EMF. A man standing with bare feet touching the earth surface. I heard that our earth...

Asked on 06/15/2021 by The Shortest Mustache Theorem

1 answer

The definition of 1 kelvin

1 K is defined as (1/273.15)th of the temperature of the triple point of water. At least, that's how it's defined in my book. But which scale is...

Asked on 06/15/2021

5 answer

Directional dependence of scale factor $a(t)$

Why does the scale factor $a(t)$ in FLRW metric has only temporal dependence but not directional? If $a(t)$ had a directional dependence, I think it would violate the...

Asked on 06/15/2021

3 answer

Trouble following Birrel and Davies in acomputing Bogoliuov coefficients

I'm having trouble following a computation from the book "quantum fields in curved spacetime" by Birrel and Davies.In the chapter Where the authors describe particle creation by a collapsing...

Asked on 06/15/2021 by Daven

0 answer

Number of Ionization event estimation

First of all, I am new in this field and therefore if I ask a silly question please forgive me.I have a gas-cell (say 3$times$3$times$3 mm$^3$...

Asked on 06/15/2021 by Bilash Krish

1 answer

What is a 'kinematic endpoint' in experimental particle physics?

In experimental particle physics, I see 'kinematic endpoint' pop up quite often. I've made an assumption of what it is but now I am not so sure. Example sentence:"This region...

Asked on 06/15/2021 by BritChick

2 answer

Intuitive understanding of the elements in the stress-energy tensor

There is an image in the Wikipedia about the stress-energy tensor: I have a rough understanding of the stress tensor: you imagine...

Asked on 06/15/2021 by Calmarius

3 answer

Einstein-Cartan theory - Book recommendation

I want to delve into Cartan's formulation of General Relativity but it don't really know where to look. Does anyone have any book suggestions?...

Asked on 06/15/2021 by fresh

2 answer

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