The curve drawn between velocity and frequency of photon in vacuum will be a
Straight line parallel to frequency axis
Straight line parallel to velocity axis
Straight line passing through origin and making an angle of $45^o$ with frequency axis
Hyperbola
In photoelectric effect if the intensity of light is doubled then maximum kinetic energy of photoelectrons will become
A $200\, W$ sodium street lamp emits yellow light of wavelength $0.6\, \mu \,m$. Assuming it to be $50\%$ efficient in converting electrical energy to light, the number of photon of yellow light it emits per second is
Photo cell is a device to
By suitable example show that particle or wave nature depend on type of experiment.