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The threshold frequency of the metal of ...

The threshold frequency of the metal of the cathode in a photoelectric cell is `1xx10^(15)Hz`. When a certain beamm of light is incident on the cathode, it is found that a stopping potential 4.144 V is required to reduce the current to zero. The frequency of the incident radiation is

A

`2.5xx10^(15)Hz`

B

`2xx10^(15)Hz`

C

`4.144xx10^(15)Hz`

D

`3xx10^(16)Hz`

Text Solution

Verified by Experts

The correct Answer is:
B
`V_(0)=(h)/(e)(v-v_(0))`
or `(v-v_(0))=(V_(0)xxe)/(h)=(4.144xx1.6xx10^(-19))/(6.63xx10^(-34))`
`v-1xx10^(15)=10^(15)`
frequency `=10^(15)+1xx10^(15)=2xx10^(15)Hz`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-ELECTRONS AND PROTONS-Exercise 1
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  2. represents a graph of most energetic photoelectrons K(max)(in eV) and ...

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  4. When ultraviolet light of wavelength 100 nm is incident upon silver pl...

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  5. Light of wavelength lamda strikes a photoelectric surface and electron...

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  6. The energy of a photon corresponding to the visible light of maximum w...

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  7. When a centimeter thick surface is illuminated with light of wavelengt...

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  8. The work function for Al, K and is 4.28 eV, 2.30 eV and 5.65 eV respec...

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  9. When photons of energy hv fall on an aluminium plate (of work function...

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  10. A photocell with a constannt potential differnce of V voolt across it,...

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  11. In a photoemissive cell, with exciting wavelength lambda, the faster e...

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  12. In a photoemissive cell, with exciting wavelength lambda, the faster e...

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  13. The threshold frequency of the metal of the cathode in a photoelectric...

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  14. Calculate the energy of a photon with momentum 3.3xx10^(-13)kg-ms^(-1)...

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  15. The energy that should be added to an electron, to reduce its de-Brogl...

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  16. A parallel beam of light is incident normally on a plane surface absor...

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  17. A particle of mass 1 mg has the same wavelength as an electron moving ...

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  18. Monochromatic light of frequency 6.0 xx 10^(14) Hz is produced by a la...

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  19. Maxwell's equations of electromagnetism and hertz experiments on gener...

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