Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
MHT CET2007PhysicsSemiconductors

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

Options

  1. Aeach emitted electron carries half the initial energy
  2. Bnumber of electrons emitted is a quarter of the initial number
  3. Ceach emitted electron carries one quarter of the initial energy
  4. Dnumber of electrons emitted is half the initial number

Correct answer

B. number of electrons emitted is a quarter of the initial number

Step-by-step solution

Key Idea Number of photoelectrons emitted per second is directly proportional to intensity of light. Intensity of light source is I 1 d² When distance is doubled, intensity becomes one-fourth. As number of photoelectrons intensity, so number of photoelectrons is quarter of the initial number.

Practice Semiconductors on Quantrex Academy →

More from Semiconductors

Pick out the correct statement from the following; 2026What is the minimum wavelength of radiation required to detect a p-n junction diode made of a semiconductor having band gap 3.3 eV. [Planck's constant h = 6.6 10³⁴ J.s ] 2026Genetic Engineering is related to the principle of 2026A silicon sample is doped simultaneously with donor impurity phosphorus at a concentration of N_D = 3 10²² m⁻³ and acceptor impurity boron at a concentration of N_D = 2.8 10²² m⁻³ 2026In a PN junction diode, the forward bias is increased gradually from 0 Volt to 1 Volt. Which of the following statements is correct? 2026In the circuit given, the reverse breakdown voltage of the Zener diode is 4.8 V. The current through the Zener and the power dissipation in Zener is: 2026An n-type and p-type semiconductor can be obtained by respectively doping pure silicon with 2026In which of the following figures, diode is reverse biased? 2026 Full Semiconductors list All MHT CET PYQs