Now users at Ask Physics can add equations to their comments and questions.

Now users at Ask Physics can add equations to their comments and questions.

Ask Physics has installed the Latex server and now users can type latex code to insert complex equations to their comments or questions. If you are not familiar with latex code, use the following site to generate the code for the equation that you need. http://www.codecogs.com/latex/eqneditor.php When you visit the above site you can edit and view the result of the code generate. You have the option to copy the image of the equation or to copy the code itself (what you typed for getting the image equation; not the…

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How light maintain its speed after refraction?

How light maintain its speed after refraction?

How light maintain its speed after refraction? -(Naveen Saxena asked) Answer: The speed of light in a medium is constant. When light enters from one medium to another, there is a change in the speed of light and the change is almost instantaneous. The speed of light in a medium depends on the electric and magnetic properties of the medium, more specifically, the electric permitivity and magnetic permeability of the medium. The speed of light in a medium is given by Wikipedia says “At the microscale, an electromagnetic wave’s phase…

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de Broglie Wavelength

de Broglie Wavelength

Alpha particle and a proton are accelerated from rest by the same potential. Find the ratio of their de- broglie wavelength (Asked by Amritha)  Answer: Charge of alpha particle = 2e Mass of alpha particle = 4 u Charge of proton = e mass of proton = u The energy acquired by proton when accelerated through a pd of V, E=eV The momentum acquired by proton= The de Broglie wavelength is given by  Therefore, de Broglie wavelength of Proton, Similarly,

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Problem from relative velocity

Problem from relative velocity

A Boat covers certain distance between two spots in a river taking t1 hrs going downstream and t2 hrs going upstream. What time will be taken by boat to cover same distance in still water? posted by STUTI Answer:

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A question from Kinematics : 100m long a train passing a 40m long bridge in 20.Find out the velocity of the train?

A question from Kinematics : 100m long a train passing a 40m long bridge in 20.Find out the velocity of the train?

Mitu asked – “100m long a train passing a 40m long bridge in 20.Find out the velocity of the train?” Ans: The total distance to be traveled by the train to completely traverse the bridge is 100 + 40 = 140 m Time = 20 s From the relation,

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