What happen when ultraviolet light shown on the zinc plate, Physics

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A zinc plate is attached to the knob of a negatively charged electroscope. 

What will occur to the leaves of the electroscope when ultraviolet light is shown on the zinc plate.  Will the leaves:

a) collapse at once

b) Gradually come together

c) Gradually spread further apart

d) Remain unaffected

Ans- Gradually come together

 


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