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Cathode Ray Experiment

103. A 5 watt...

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103. A 5 watt source emits monochromatic light of wavelength 5000A^° .when placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, the number of photoelectrons liberated will be reduced by a factor of 1) 8 2) 16 3) 2 4) 4

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Q. A 5 W source emits monochromatic light of wavelength

5000^{0}

. when placed 0.5 m away. it liiberates photoelectrons from a photosensitive metallic surface, When the source is moved to a distance of 1.0 m, the number of photoelectrons liberated will be reduced by a factor of :

Q. A 5 watt source emits monochromatic light of wavelength 5000 A when placed 0.5 m away, it liberates photoelectric from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, The numbers of photo electrons liberated will:

Q. Photoelectric cell is illuminated by a small intense source distant 1 m from it. When the same source is placed at a distance 2 m then the number of photoelectrons emitted from the cathode will be

Q. A cylindrical source of light which emits radiation radially (from a curved surface) only, placed at the center of a hollow, metallic cylindrical surface, as shown in the diagram.
The power of the source is

90

watt and it emits light of wavelength

4000 A

only. The emitted photons strike the metallic cylindrical surface which results in the ejection of photoelectrons. All ejected photoelectrons reach the anode (light source). The magnitude of photocurrent in amp is

[G i v e n : h = 6.4 \times 10^{- 34} J / s e c]

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Q. A monochromatic source of light is placed at a large distance

d

from a metal surface. Photoelectrons are ejected at rate

n

, the kinetic energy being

E

. If the source is brought nearer to distance

d / 2

, the rate and kinetic energy per photoelectron become nearly :

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