EASY
CUET (UG)
IMPORTANT
Earn 100
Assertion: Photo-electric effect demonstrates particle nature of light.
Reason: Number of photons is proportional to frequency of photons.
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Important Questions on Dual Nature of Radiation and Matter
EASY
CUET (UG)
IMPORTANT
A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m then
EASY
CUET (UG)
IMPORTANT
When radiation of the wavelength is incident on a metallic surface, the stopping potential is If the same surface is illuminated with radiation of double the wavelength, then the stopping potential becomes . Then the threshold wavelength for the surface is
EASY
CUET (UG)
IMPORTANT
Monochromatic radiation of intensity falls on a metal surface and the number of photoelectrons and their maximum kinetic energy are and respectively. If the intensity of radiation is , what is the number of emitted electrons and their maximum kinetic energy respectively?
EASY
CUET (UG)
IMPORTANT
The maximum kinetic energy of photoelectrons emitted from a surface, when photons of energy fall on it, is . The stopping potential in volts is:
EASY
CUET (UG)
IMPORTANT
Ultraviolet light falls on metal surface then electrons are emitted named as
EASY
CUET (UG)
IMPORTANT
A cathode emits electrons per second, when heated. When is applied to anode all the emitted electrons reach the anode. The charge on electron is . The maximum anode current is
EASY
CUET (UG)
IMPORTANT
The light of radiation falls on a photocell operating in the saturation mode. The spectral sensitivity is . The yield of photoelectrons (i.e. number of electrons produced per photon) is
EASY
CUET (UG)
IMPORTANT
In photoelectric effect, stopping potential depends on
