1.

Which of the following experiment in Photoelectriceffect will support particle nature of light ?

Answer»

Photocurrent is set up almost instantaneously even with FAINT light of sufficientlysmall wavelength.
Existence of cutoff potential which depends UPON wavelength of radiation incident on emitter.
Existenceof thersold wavelengthfor incidentradiation above which no photocurrent can be set up.
Existence of saturation current which increase with intensityof radiation incident on emitter.

Solution : Obrivationin 'A' can be EXPLAINED only when we assume energy of incident radiation to be in form some packets. Observation in 'B' and 'C' can be explained by EINSTEIN FORMULA `K=(hc)/(lambda)-Phi` which supports particle nature.


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