Light of wavelength 3000 Å is incident on a metal surface whose work function is 1 eV . The maximum velocity of emitted photoelectrons will be

Question

Light of wavelength 3000 Å is incident on a metal surface whose work function is 1 eV . The maximum velocity of emitted photoelectrons will be, 10 m s - 1, 10 3 m s - 1, 10 4 m s - 1, 10 6 m s - 1

MARKS App · Accepted Answer

1 2 m v 2 = h c λ - ϕ 0 = 6.63 × 10 - 34 × 3 × 10 8 ( 3 × 10 - 7 ) × 1.6 × 10 - 19 - 1 = 4.14 - 1 = 3.14 e V or v = 2 × 3.14 × 1.6 × 10 - 19 9.1 × 10 - 31 = 10 6 m s - 1

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