Light of frequency 7.21 × 10 14 Hz is incident on a metal surface. Electrons with a…
Physics · Class 12 · CBSE — Dual Nature of Radiation & Matter
Light of frequency 7.21 × 1014 Hz is incident on a metal surface. Electrons with a maximum speed of 6 × 105 m s–1 are ejected from the surface. The threshold frequency for photoemission of electrons is
(Given h = 6.63 × 10–34 J s, me = 9.1 × 10–31 kg)
(Given h = 6.63 × 10–34 J s, me = 9.1 × 10–31 kg)
- 2.32 × 1014 Hz
- 2.32 × 1012 Hz
- 4.74 × 1014 Hz
- 4.74 × 1012 Hz
Answer
(C) 4.74 × 10 14 Hz
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