Question

Einstein's photoelectric equation is?

• A. $E_{max}=\frac{hc}{\lambda }+2{\phi }_0$
• B. $E_{max}=h\nu -{\phi }_0$
• C. $E_{max}=hv+{\phi }_0$
• D. $E_{max}=\frac{2hc}{\lambda }+{\phi }_0$

Answer 1

Answer: (B)

Photoelectrons from the metal surface are emitted when a light having frequency greater than the threshold frequency of the metal surface is incident on it.
Maximum kinetic energy of the emitted photo electrons is given by $E_{max}=h\nu -{\phi }_o$
where $\nu$ is the frequency of incident light and ${\phi }_o$ is the work function of metal surface.