Question

if a light of wavelength 4000 A 2 points
is incident on the metal
surface of work function 5 eV
will the electron be ejected or
not. *​

Answer 1

Answer:

no

Explanation:

Energy of incident light must be >or=work function of metal

12400/4000=3.1eV which is less than 5eV

so electrons will not be ejected

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Answer 2

ANSWER

we know

• light ray is a bundle of photon

• energy of incident photon = hc/lamda

• but as here work function is given in ev

..for calculation of energy of incident photon

in electeon volt formula is

= 12400/lamda where lamda is in angstrom

apply this

energy of photon E = 12400 /4000

= 3.1 ev

here given that work function is 5 ev . for electron to be released photon energy must greater then work function

for example :- a book apply force of 10 newton on a table. for move that book you also have to apply force of 10 newton .

so result is electeon not to be ejected

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