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Light of frequeny 1.5 times the threshol...

Light of frequeny 1.5 times the threshold frequency , imcident on a photo sensitive material .If the frequency of incident light is halved and the intensity is doubled the photo current becomes

A

four times

B

double

C

half

D

zero

Text Solution

Verified by Experts

The correct Answer is:
D
Incident frequency `upsilon =(1.5upsilon_(0))/(2) =0.75upsilon_(0)` , since `upsilon lt upsilon_(0)`, no photoelectric effect
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CP SINGH-PHOTOELECTRIC EFFECT-EXERCISES
  1. In photoelectric emission the number of electrons ejected per second i...

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  2. When monochromatic radiation of intensity I falls on a metal surface, ...

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  3. Light of frequeny 1.5 times the threshold frequency , imcident on a ph...

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  4. If the wavelength of light in an experiment on photoelectric effect is...

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  5. When ultraviolet radiation is incident on a surface, no photoelectrons...

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  6. A non-monochromatic light is used in an experiment on photoelectric ef...

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  7. When the intensity of a light source is increased

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  8. The photocurrent in an experiment on photoelectric effect increases if

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  9. A point source of light is used in a photoelectric effect. If the sour...

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  10. A phot of energy h upsilon is absorbed by a free electron of a metal h...

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  11. Photoelectric effect supports quantum nature of light because (a) th...

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  12. If the frequency of light in a photoelectric experiment is doubled the...

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  13. Two identical metal plates show photoelectric effect by a light of wav...

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  14. The cathode of a photoelectric cell is changed such that the work func...

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  15. The frequency and intensity of a light source are both doubled. Consid...

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  16. The threshold wavelength for photoelectric emission from a material ...

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  17. A photoelectric cell is illuminated by a point source of light 1 m awa...

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  18. If the distance of 100 Watt lamp is increased from a photocell, the sa...

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  19. A point source causes photoelectric effect from a small metal plate. W...

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  20. When a monochromatic point source of light is at a distance of 0.2 m...

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