In an experiment of photoelectric effect, light from a poin…

Physics Ray Optics Mix MCQ (Single Correct)

In an experiment of photoelectric effect, light from a point source of monochromatic light of wavelength 3000 Å is incident on a metal surface. The kinetic energies of photoelectrons range from zero to 4.0 × 10 –19 J, then –

Stopping potential for this light is 2.5 V

Threshold wavelength for the material is 7590Å

Stopping potential will be doubled on reducing the distance and the wavelength of light source to half

Saturation current will be doubled onreducing the distance of source to half

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CHECK THE SOLUTION.

(a, b)

K max = 4 × 10 –19 J = = 2.5 eV

⇒ Stopping potential = 2.5 eV

K max = hc

2.5 = –

λ 0 = 759 nm

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