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When a piece of sodium or potassium ar...

When a piece of sodium or potassium are exposed to sunlight ……..

A

they will become negatively charged.

B

will be remain neutral.

C

they will become positively charged

D

will emit proton.

Text Solution

Verified by Experts

The correct Answer is:
C
When these pieces are exposed to sunlight,due to photo-electric effect electrons are emitted .So,positive charge remains on the pieces .So they will become positively charged .
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KUMAR PRAKASHAN-DUAL NATURE OF RADIATION AND MATTER-Section-D (multiple choice questions (MCQs)
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  2. If ratio of threshold frequencies of two metals is 1:3 ,ratio of their...

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  3. When a piece of sodium or potassium are exposed to sunlight ……..

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  4. If photo-electric effect is not seen with the ultraviolet radiation in...

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  5. Threshold wavelength of metal is 30 Å If radiation of 2000Å Is inciden...

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  6. Work function of metal A,B and C are 4.5 eV 4.3 eV and 3.8eV respectiv...

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  7. What will be maximum value of wavelength by which photo-electric emiss...

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  8. A metal surace objects electrons when hit by green light but none when...

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  9. Photo-electric emission is observed from a metalli surface for frequen...

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  10. If photo-electric effect,when frequency of incident radiation is doubl...

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  11. For metals cesium ,potassium ,sodium and lithium graph of stopping pot...

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  12. Maximum kinetic energy of photoelectron emitted is independent of ……

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  13. In two different experiment X-rays are incident on sodium metal and th...

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  14. Ultraviolet radiation in incident on sodium metal.Then visible light i...

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  15. When monochromatic source is kept at distance of 0.2 m from photocell,...

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  16. Maximum speed of electron emitted from metal surface is 5xx10^(6 )ms^(...

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  17. The work function of a metal surface is 4.2 eV. The maximum wavelength...

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  18. Threshold frequency for metal surface is 4xx10^(14) Hz.When radiation ...

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  19. On metal surface radiation of 2000Å and 5000 Å is incident sequentiall...

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  20. Slope of V(0)toV graph shows…..

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