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Light of wavelength 3000 Å falls on a se...

Light of wavelength 3000 `Å` falls on a sensitive surface. If the surface has received `10^-7` J of energy, then number of photons just falling on the surface area

A

`1.5 xx10^6`

B

`1.5 xx10^11`

C

`1.5 xx10^3`

D

`2.5 xx10^11`

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The correct Answer is:
B
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TARGET PUBLICATION-ELECTRONS AND PHOTONS-Evaluation Test
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  2. Radiation of wavelength 120 nm ejects photoelectrons from a plate whos...

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  3. A surface receives light of wavelength lambda1=450 nm, causing the eje...

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  4. Assertion: Photons can exist at rest. Reason: Rest mass m0=msqrt(((1...

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

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  6. Assertion: Work function of a metal is 4 eV. The maximum wavelength of...

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  7. Eye of an experimenter detects the green light (lambda =5000 Å) at 5xx...

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  8. Photon having wavelength lambda = 3.5xx10^(-7)m and lambda = 5.4xx10^(...

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  9. Illuminating a metal surface alternately with wavelengths lambda1 and ...

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  10. In a photoelectric effect, the anode potential is plotted against the ...

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  11. A proton when accelerated through a potential difference of V volt has...

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  12. The work function for the following metals is given Na: 2.75 eV, K:2.3...

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  13. Assertion: Work function of a metal is proportional to maximum wavelen...

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  14. The retarding potential for having zero photoelectron current

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  15. A proton and an alpha-particle are accelerated through same potential ...

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  16. Light of wavelength 3000 Å falls on a sensitive surface. If the surfac...

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  17. The work function for aluminium is 4.125 eV. The cut-off wavelength fo...

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  18. Lights of two different frequencies whose photons have energies 1 eV a...

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  19. When a metal surface is illuminated by a monochromatic light of wave-l...

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