Questions in Dual Nature of Radiation and Matter

Select	Question
	Which of the following is incorrect statement regarding photon
	If a photon has velocity c and frequency ?, then which of following represents its wavelength
	The mass of a photo electron is
	Energy of photon whose frequency is ${10^{12}}MHz,$ will be
	There are ${n_1}$ photons of frequency ${\gamma _1}$ in a beam of light. In an equally energetic beam, there are ${n_2}$ photons of frequency ${\gamma _2}$. Then the correct relation is
	Einstein's photoelectric equation states that${E_k} = h\nu - \varphi $. In this equation $3 \times {10^{23}}$ refers to
	Kinetic energy with which the electrons are emitted from the metal surface due to photoelectric effect is
	The threshold wavelength for photoelectric emission from a material is 5200 Å. Photo-electrons will be emitted when this material is illuminated with monochromatic radiation from a
	Threshold frequency for a metal is ${10^{15}}$Hz. Light of $\lambda = 4000{\AA}$falls on its surface. Which of the following statements is correct
	Photo cells are used for the