Electromagnetic Waves — Physics STD 12 Science — Question

A proton and a deuteron have the same velocity; what is the ratio of their de Broglie wavelengths?

Suppose you are told that the linear size of everything in the universe has been doubled overnight. Can you test this statement by measuring sizes with a metre stick? Can you test it by using the fact that the speed of light is a universal constant and has not changed? What will happen if all the clocks in the universe also start running at half the speed?

How the speed of revolving electron in stable orbit is related to principal quantum number?

Write the definition of electric current and ampere (A) and different units of electric current.

Explain the Bohr's Quantum condition of angular momentum. What will be the value of it, for the second orbit of electron?

By looking at the construction of a compound microscope and a telescope, how will you distinguish which type of optical instrument is which?

The total energy of electron is negative. What do you mean by this fact? It is positive then what is the indication?

Explain polarisation of polar molecule in uniform electric field.

Is it true that the reaction of a gravitational force is always gravitational, of an electromagnetic force is always electromagnetic and so on?