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The work function for cs atom …

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The work function for cs atom is 1.9ev calculated (a) threshold wavelength (b) threshold frequency If the cs element is irradiated with wavelength 500nm calculated the kinetic energy velocity of ejected photoelectron

Posted by Chhavi Arora 4 years ago

CBSE > Class 11 > Chemistry

1 answers

Yogita Ingle 4 years ago

A) Work function of caesium (WO) = hv_o

Therefore v_o = W_O/h = 1.9 x1.602 x10^-19/ 6.626x10^-34

= 4.59x10¹⁴/sec

B) λ_o =c/v_o = 3x10⁸/ 4.59x10¹⁴ = 6.54x10^-7m

C) K.E of ejected electron = h(v-v_o) = hc(1/λ – 1/ λ_o)

=(6.626x3x10^-26) (1/500x10^-9 – 1/654x10^-9)

=(6.626x3x10^-26) / 10^-9(154/500x654)

= 9.36x10^-20J

k.E = 1mv²/2 = 9.36x10^-20J

=9.1x10^-31/2 = 9.36x10^-20J

v2 = 20.55x10¹⁰m²s^-2

v = 4.53x10⁵ms^-1

1Thank You

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