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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2012
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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 3.57 V. The threshold frequency of the material is


( A ) $4.\times 10^{15}$ Hz
( B ) $5 \times 10^{15}$ Hz
( C ) $1.6\times 10^{15} Hz$
( D ) $2.5 \times10^{15}$ Hz

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