If c is the velocity of light in free space, the correct statements about photons among the following are: (A) The energy of a photon is E = h\nu . (B) The velocity of a photon is c. (C) The momentum of a photon, p = h\nu /c. (D) In a photon-electron collision, both total energy and total momentum are conserved. (E) Photon possesses a positive electric charge.

Light with an energy flux of $25 \times 10^4$ Wm$^{-2}$ falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm$^2$, then the average force exerted on the surface is:

The dependence of the short wavelength limit $\lambda_{min}$ on the accelerating potential $V$ is represented by the curve of figure:

A certain metallic surface is illuminated with monochromatic light of wavelength $\lambda$. The stopping potential for photoelectric current for this light is $3V_0$. If the same surface is illuminated with light of wavelength $2\lambda$, the stopping potential is $V_0$. The photoelectric effect's threshold wavelength for this surface is?

An electron (mass m) with an initial velocity v = v₀î (v₀ > 0) is in an electric field E = -E₀î (E₀ = constant > 0). Its de Broglie wavelength at the time t is given by: