Answered: Calculate the wavelength of light, in…

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter6: Photons And Matter Waves

Section: Chapter Questions

Problem 96P: What is the longest wavelength that light can have if it is to be capable of ionizing the hydrogen...

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Calculate the wavelength of light, in nm, illuminating a barium surface if the threshold frequency of barium is 6.07×10¹⁴ Hz and the kinetic energy of the electron emitted is 1.31×10^-18 J.

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$Answe r : - Given threshold frequancy (v_{o}) = 6.07 \times 10^{14} kinetic energy (KE) = 1, 31 \times 10^{- 18} J W K T planks constant (h) = 6.626 \times 10^{- 34} J \sec . threshold energy (\emptyset) = {hv}_{o} = 6.626 \times 10^{- 34} \times 6.07 \times 10^{14} \emptyset = 4.02 \times 10^{- 23} J Total energy (E) = KE + \emptyset = 1.31 \times 10^{- 18} + 4.02 \times 10^{- 23} = 1.31004 \times 10^{- 18} J$

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