Dual Nature of ...

A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then

The photosensitive surface is receiving light of wavelength 5000 Å at the rate of 10^-8 J–s^-1 . The number of photons received per sec is

When light of wavelength 300 nm, falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, light of wavelength 600 nm is sufficient for liberating photoelectrons. The ratio of the work function of the two emitters is

Maximum velocity of the photoelectrons emitted by a metal surface is 1.2 × 10⁶ms^-1 . Assuming the specific charge of the electron to be 1.8 × 10¹¹C kg^-1, the value of the stopping potential in volt will be

Which one of the following graph represents the variation of maximum kinetic energy (E_k) of the emitted electrons with frequency v in photoelectric effect correctly ?

A and B are two metals with threshold frequencies 1.8 × 10¹⁴ Hz and 2.2 × 10¹⁴ Hz. Two identical photons of energy 0.825 eV each are incident on them. Then, photoelectrons are emitted by (take, h = 10^-34 J-s )

In an experiment on photoelectric emission from a metallic surface, wavelength of incident light is 2 × 10^-7 m and stopping potential is 2.5 V. The threshold frequency of the metal (in Hz) approximately (charge of electron, e = 1.6 × 10^-19 C, Planck's constant, h = 6.6 × 10^-34J-s)

Light of wavelength 5000 Å is falling on a sensitive surface. If the surface has received 10^-7 J of energy, then the number of photons falling on the surface will be

The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV and the stopping potential for a radiation incident on this surface is 5V. The incident radiation lies in

The specific charge of a proton is 9.6 × 10⁷ C kg^-1 . The specific charge of an alpha particle will be