Question

The kinetic energy of photo-electron emitted on irradiating a metal surface with frequency $v$ is related by $KE=hv-IE$. The plots of $KE$ $vs$. incidented frequency $v$ shows:

• A. a straight line with intercept on $x$-axis equal to threshold frequency.
• B. a straight line with slope equal to Planck's constant.
• C. a straight line with extra polated intercept on $y$-axis equal to ionization energy.
• D. a straight line with intercept on $x$-axis equal to the product of threshold frequency and Planck's constant.

Answer 1

Answer: (A), (B), (C)

a straight line with intercept on $x$-axis equal to threshold frequency.
a straight line with slope equal to Planck's constant.
a straight line with extra polated intercept on $y$-axis equal to ionization energy.

From figure it can be seen that,a straight line with intercept on $x$-axis equal to threshold frequency,a straight line with slope equal to Planck's constant,a straight line with extra plotted intercept on $y$-axis equal to ionization energy.