If your answer is Option 2, 4 Then you have to fill the OMR sheet 24
And If your answer is Option 1, 3, 4 Then you have to fill the OMR sheet 134
The incident photon involved in the photoelectric effect experiment
1) May completely disappear
2) Must come out with a decreased frequency
3) May come out with an increased frequency
4) May come out without change in frequency

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answer is 14.

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Detailed Solution

Case I: When the frequency of light is below the threshold frequency, no electrons are ejected and the photon is released with the same frequency.
Case II: When the frequency of the light exceeds the threshold frequency, some energy goes in overcoming the work function energy, while remaining energy is converted into the kinetic energy of the ejected electron. Photon thus entirely vanishes.

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