The frequency of yellow light having wavelength $600 \ nm$ is

If $p$ is the momentum of the fastest electron ejected from a metal surface after the irradiation of light having wavelength $\lambda$,then for $1.5 \ p$ momentum of the photoelectron,the wavelength of the light should be: (Assume kinetic energy of ejected photoelectron to be very high in comparison to work function)

Which of the following is not an electromagnetic radiation?

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

Calculate the wavelength of yellow light having a frequency of $5.09 \times 10^{14} \ Hz$.

The hydrogen spectrum from an incandescent source of hydrogen is: