Questions in Dual Nature of Radiation and Matter

Select	Question
	If the wavelength of light is 4000 Å, then the number of waves in 1 mm length will be
	The velocity of photon is proportional to (where ? is frequency)
	If the work function of a photometal is 6.825 eV. Its threshold wavelength will be $(c = 3 \times {10^8}\,m/s)$
	A photon of energy 8 eV is incident on a metal surface of threshold frequency $1.6 \times {10^{15}}\,Hz$, then the maximum kinetic energy of photoelectrons emitted is $(h = 6.6 \times {10^{ - 34}}\,Js)$
	If the energy of the photon is increased by a factor of 4, then its momentum
	The ratio of the energy of a photon with $\lambda = 150\,nm$ to that with $\lambda = 300\,nm$ is
	Photo-electric effect can be explained by
	In photoelectric effect, the K.E. of electrons emitted from the metal surface depends upon
	The photoelectric effect can be understood on the basis of
	If the threshold wavelength for sodium is 5420 Å, then the work function of sodium is