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Physics : Recent Questions and Answers (Page 229)

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

Why does the focusing efficiency drop with numerical aperture for a microscope objective?

I am doing the following experiment in my lab. I have a collimated laser beam, which is focused by a lens. Then the light is collected by a microscope objective....

Asked on 06/28/2021 by Anton Baranikov

2 answer

Direction of displacement

Displacement is defined as the vector obtained by joining the final position to the initial position (head towards the final position). Well,i know this is silly but what are these...

Asked on 06/28/2021 by Waleed

1 answer

How to calculate kinetic friction coefficient given velocity and height?

The problem I am dealing with is about an object sliding down a ramp. I am only given the height of the top of the ramp to the floor, initial...

Asked on 06/28/2021 by uppynum

1 answer

Superextremal galactic Reissner-Noström blackholes

To celebrate 10 upvotes but no attempt at answers of this 8-year old question regarding extremality of Reissner-Noström blackholes, Let's formulate a physically feasible scenario for driving a galactic...

Asked on 06/28/2021

1 answer

How does cold make batteries drain faster yet simultaneously they should be refrigerated to keep a charge?

I have always known via common knowledge that batteries drain quicker when it's cold. I've been told it's best to keep them in an inner pocket close to body heat...

Asked on 06/28/2021

1 answer

Why doesn't a car moving on a curved path have a horizontal gravity force but it has a horizontal normal force?

So I was wondering.. When we solve questions of an object sliding on an incline, we consider the force of gravity to have two components, a horizontal and a vertical,...

Asked on 06/28/2021 by Talal Sharaa

2 answer

Doppler Effect in Slow Light

As experimentally slow light is possible, i.e. light at or near speed of 20m/s.So suppose observer in room with slow light moves faster than slow light...

Asked on 06/28/2021

1 answer

Can a body float in the middle of a fluid?

Let's say we have a cubic body of side $a$ and made of a material with density $rho$ and we measure its immersed height in a fluid of...

Asked on 06/28/2021 by Rudy Davids

4 answer

Creating multiparticle states from vacuum in QFT

In creating multiparticle states from the vacuum we apply the creation operators,begin{align}&|p_1,s_1rangle=a^{dagger}_{p_1,s_1}|0rangle,&|p_1,s_1;p_2,s_2rangle=a^{dagger}_{p_1,s_1}a^{dagger}_{p_2,s_2}|0rangle,& ...quad ...quad ...quad ...quad ...quad ...&|p_1,s_1;p_2,s_2;...,,...;p_n,s_nrangle=a^{dagger}_{p_1,s_1}a^{dagger}_{p_2,s_2}...,..., ...a^{dagger}_{p_n,s_n}|0rangle qquad qquad text{etc.}end{align}...

Asked on 06/28/2021

0 answer

Meaning of "unification of interactions"

What do we exactly mean when we speak about "unification of two interactions" or say "the electromagnetic and weak interactions are unified"?Wikipedia states that: the electromagnetic and...

Asked on 06/28/2021

1 answer

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