Light of wavelength $330 nm$ is incident separately on four metals P, Q, R and S whose work functions are $2.2$ , $3.6$ , $4.2$ and $3.9 eV$ respectively. Use $h = 6.626 \times 1 0^{- 34} J s$ , $c = 3.0 \times 1 0^{8} m s^{- 1}$ , $1 eV = 1.6 \times 1 0^{- 19} J$ . Select the correct statements.

AMetal P emits electrons with maximum kinetic energy about $1.6 eV$
BMetal Q emits electrons
CMetal R emits electrons
DMetal S emits electrons

Answer: A, B

Photon energy = hc/

λ

= 3.76 eV. Emission needs E > W. P: 3.76 - 2.2 = 1.56 eV, so it emits. Q (3.6) also emits, with 0.16 eV. R (4.2) and S (3.9) exceed the photon energy and do not emit.

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Light of wavelength 330 nm is incident separately on four metals P, Q, R and S whose work functions are 2.2, 3.6, 4.2 and 3.9 eV respectively. Use h=6.626×10−34 Js, c=3.0×108 ms−1, 1 eV=1.6×10−19 J. Select the correct statements.

Answer: A, B

More questions on Quantum theory of light and photoelectric effect

Light of wavelength $330 nm$ is incident separately on four metals P, Q, R and S whose work functions are $2.2$ , $3.6$ , $4.2$ and $3.9 eV$ respectively. Use $h = 6.626 \times 1 0^{- 34} J s$ , $c = 3.0 \times 1 0^{8} m s^{- 1}$ , $1 eV = 1.6 \times 1 0^{- 19} J$ . Select the correct statements.