HSC Science (Electronics) 12th Board ExamMaharashtra State Board
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# The Work Function for a Metal Surface is 2.2ev. If the Light of Wavelength 5000å is Incident on the Surface of the Metal, Find the Threshold Frequency and Incident Frequency. Will There Be an Emission of Photoelectrons Or Not? - HSC Science (Electronics) 12th Board Exam - Physics

ConceptEinstein’s Equation - Particle Nature of Light

#### Question

The work function for a metal surface is 2.2eV. If the light of wavelength 5000Å is incident on the surface of the metal, find the threshold frequency and incident frequency. Will there be an emission of photoelectrons or not? (c = 3 x 108 m/ s, 1eV = 1.6x10-19 J , h = 6.63 x 10-34 J.s.)

#### Solution

E = hv

= "h.c"/lambda = (6.6xx10^(-34)xx 3 xx 10^8)/(5000xx 10^(-10) xx 1.6xx10^(-19)) = 2.4 eV

Emisssion is not possible

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#### APPEARS IN

2017-2018 (March) (with solutions)
Question 8.2 | 7.00 marks

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Solution The Work Function for a Metal Surface is 2.2ev. If the Light of Wavelength 5000å is Incident on the Surface of the Metal, Find the Threshold Frequency and Incident Frequency. Will There Be an Emission of Photoelectrons Or Not? Concept: Einstein’s Equation - Particle Nature of Light.
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