Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be `3.57V`. The threshold frequency of the material is
A
` 1.6 xx 10^(15) Hz `
B
`2.5 xx 10^(15) Hz `
C
`4 xx 10^(15) Hz `
D
`5 xx 10^(15) Hz `
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The correct Answer is:
A
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