On a photosensitive material, when the frequency of incident radiation is increased by 30 % , the kinetic energy of emitted photoelectrons increases from 0.4 eV to 0.9 eV . The work function of the surface is

Question

On a photosensitive material, when the frequency of incident radiation is increased by 30 % , the kinetic energy of emitted photoelectrons increases from 0.4 eV to 0.9 eV . The work function of the surface is (A) 1 eV  (B) 1.267 eV (C) 1.4 eV (D) 1.8 eV

Tardigrade Admin · Accepted Answer

hv=0.4+W0 ....... (i) 1.3 hv=0.9+W0 ....... (ii) (ii) - 1.3 (i) gives 0.3 W0=0.9-1.3 (.0.4.) ∴ W0=(0.38/0.3)=1.267 eV

Q. On a photosensitive material, when the frequency of incident radiation is increased by $30%$ , the kinetic energy of emitted photoelectrons increases from $0.4 e V$ to $0.9 e V$ . The work function of the surface is

$1 e V$

$1.267 e V$

$1.4 e V$

$1.8 e V$

$h v = 0.4 + W_{0}$ ....... (i)
$1.3 h v = 0.9 + W_{0}$ ....... (ii)
(ii) - 1.3 (i) gives
$0.3 W_{0} = 0.9 - 1.3 (0.4)$
$∴ W_{0} = \frac{0.38}{0.3} = 1.267 e V$

Q. On a photosensitive material, when the frequency of incident radiation is increased by 30% , the kinetic energy of emitted photoelectrons increases from 0.4eV to 0.9eV . The work function of the surface is

1eV

1.267eV

1.4eV

1.8eV