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======= ####47. A 5 watt source emits monochromatic light of wavelength $5000 \AA$ . 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 [2007]

c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) 8

(b) 16

(d) 4

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Answer:

Correct Answer: 47. (d)

Solution:

(d) Number of emitted electrons $N_{E} \propto$ Intensity

$\propto \frac{1}{(Distance)^{2}}$

Therefore, as distance is doubled, $N_{E}$ decreases by $(1 / 4)$ times.

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Dual Nature of Radiation and Matter - Result Question 45

47. A 5 watt source emits monochromatic light of wavelength 5000\AA. When placed 0.5m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0m, the number of photoelectrons liberated will be reduced by a factor of [2007]

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47. A 5 watt source emits monochromatic light of wavelength $5000 \AA$ . 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 [2007]