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CUET
Physics
Dual Nature of Radiation and Matter
a
b
c
d
$ V = \frac{1240}{\lambda} -\frac{\phi}{e}$
$ V_1 - V_2 = \frac{1240}{\lambda_1} - \frac{1240}{\lambda_2} = \frac{1240}{300} - \frac{1240}{400}= 1V$