Questions in Dual Nature of Radiation and Matter

Select	Question
	When a metal surface is illuminated by light of wavelengths 400 nm and 250 nm, the maximum velocities of the photoelectrons ejected are $v$ and $2v$ respectively. The work function of the metal is (h = Planck’s constant, c = velocity of light in air)
	4 eV is the energy of the incident photon and the work function in $2eV.$ What is the stopping potential
	Light of frequency $\nu$ is incident on a certain photoelectric substance with threshold frequency $\nu _0$. The work function for the substance is
	If threshold wavelength for sodium is 6800Å then the work function will be
	If intensity of incident light is increased in PEE then which of the following is true
	Light of frequency $8 \times {10^{15}}Hz$ is incident on a substance of photoelectric work function $6.125\,eV.$ The maximum kinetic energy of the emitted photoelectrons is
	The photoelectric threshold wavelength for potassium (work function being $2eV$) is
	Photons of energy 6 eV are incident on a metal surface whose work function is 4 eV. The minimum kinetic energy of the emitted photo-electrons will be
	According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum
	The lowest frequency of light that will cause the emission of photoelectrons from the surface of a metal (for which work function is 1.65 eV) will be