The metal used for making radiation shield is

If the energies of two photons are in the ratio of $3:2$,their wavelengths will be in the ratio of

The photoelectric effect shows:

$A$ metal surface emits photoelectrons when the incident radiation possesses a minimum.....

$A$ particular radio station broadcasts at a frequency of $1120 \, kHz$. Another radio station broadcasts at a frequency of $98.7 \, MHz$. What will be the wavelength of the radiation for each station?

Calculate the energy of one mole of photons of radiation whose frequency is $5 \times 10^{14} \ Hz$.