Assertion: Work function of a metal is $5 \mathrm{eV}$. The maximum wavelength of photons required to emit electrons from its surface is $2480 \stackrel{\circ }{\mathrm{A}}$
Reason: Work function, ${\varphi }_0=\frac{hc}{{\lambda }_{\max }}$

Assertion: If the maximum kinetic energy of electrons emitted by a photocell is $5 \mathrm{eV}$, then the stopping potential is $5 \mathrm{V}$.

Reason: Stopping potential for the fastest photoelectrons is numerically equal to their kinetic energy.