A light wave described by E=60( sin ⁡(3 10^15)t+ sin ⁡(12 10^15)t) (in SI units) falls on a metal surface of work function 2.8 eV . The maximum kinetic energy of ejected photoelectron is (approximate…

Question

A light wave described by E=60( sin ⁡(3 10^15)t+ sin ⁡(12 10^15)t) (in SI units) falls on a metal surface of work function 2.8 eV . The maximum kinetic energy of ejected photoelectron is (approximately) \_ \_ \_ \_ eV. ( h=6.6 10^-34 J. s. and e=1.6 10^-19C)

Accepted Answer

Correct answer: C. (c) Light contains two frequencies: _1=3 10^15 rad/s and _2=12 10^15 rad/s For maximum KE, use higher frequency _2. Energy: E_2= h _22 = 6.6 10^-34 12 10^152 = 79.2 10^-196.28=12.6 10^-19 J=7.9 eV KE_ max=E_2- =7.9-2.8=5.1 eV

$A light wave described by E = 60 (sin (3 \times 10^{15}) t + sin (12 \times 10^{15}) t) (in SI units) falls on a metal surface of work function 2.8 eV . The maximum kinetic energy of ejected photoelectron is (approximately)____eV. (h = 6.6 \times 10^{- 34} J . s. and e = 1.6 \times 10^{- 19} C)$

Solution

More Dual Nature of Matter & Radiation PYQs