Find out the mass of photon with wavelength `3.6 overset (@)A`.

What is rest mass of photon?

Calculate the energy of a photon of wavelength 6 xx 10^(-5) cm.

Find out odd one.

What is blue shift? Sodium light of wavelength 589.0overset(@)A travelling from a galaxy is observed to be 589.6overset(@)A . What is the speed of the galaxy?

Find out the maximum frequency and minimum wavelength of X ray produced by 30 KV electrons.

Calculate the energy of one mole of photons of radiations having wavelength 300 nm. (c=3xx10^(8) mS^(-1) , h= 6.626xx10^(-34)JS) .