Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main 2005
Exam
JEE Main
Year
2005
Subject
Physics
Chapter
Dual Nature of Matter

JEE Main 2005 · Physics · Dual Nature of Matter

A photocell is illuminated by a small bright source placed 1 ~m...

A photocell is illuminated by a small bright source placed 1 m1 \mathrm{~m} away. When the same source of light is placed 12 m\frac{1}{2} \mathrm{~m} away, the number of electrons emitted by photo cathode would

Options

  1. Adecrease by a factor of 4
  2. Bincrease by a factor of 4
  3. Cdecrease by a factor of 2
  4. Dincrease by a factor of 2

Correct answer

B. increase by a factor of 4

Step-by-step solution

I∝1r2I \propto \frac{1}{r^2}
Practice Dual Nature of Matter on Quantrex Academy →

More from Dual Nature of Matter

K_1 and K_2 be the maximum kinetic energies of photoelectrons emitted from a surface of a… JEE Main 2026The de Broglie wavelength for an electron accelerated through the potential difference of… JEE Main 2026Given below are two statements: one is labelled as Assertion (A) and the other is… JEE Main 2026An electron is travelling with a velocity v in free space and when it enters a medium… JEE Main 2026An electron of mass m is moving in an electric field E = -2E_0 i ( E_0 = constant > 0 )… JEE Main 2026Light source having wavelength 331 nm is used to generate photo-electrons whose stopping… JEE Main 2026Match the LIST-I with LIST-II List-I List-II A. Planck's constant I. ML^2T^ -2 B.… JEE Main 2026The de Broglie wavelength associated with an electron accelerated through a potential… JEE Main 2026 Full Dual Nature of Matter list All JEE Main PYQs