NEET Physics Dual Nature of Matter and Radiation MCQs

A photocell with a work function of 2.5 eV is illuminated by light of wavelength 400 nm. What is the maximum speed of the emitted photoelectrons? (Planck's constant $h = 6.63 imes 10^{-34}$ Js, speed of light $c = 3 imes 10^8$ m/s, mass of electron $m_e = 9.11 imes 10^{-31}$ kg)

A broken ligament is being ‘welded’ back in place using 20 ms pulses from a 0.5 W laser operating at a wavelength of 632 nm. The number of photons in 5 pulses of laser are

Photons emitted in transition of electrons from n = 2 to n = 1 in hydrogen atom is made to fall on a metal surface with work function 1.2 eV. The maximum velocity of photoelectron emitted is nearly equal to

The work function of a metal is ${W_0}$ and $\lambda$ is wavelength of incident radiation. There is no emission of photoelectron when

When ultraviolet radiation is incident on a surface, no photoelectrons are emitted. If a second beam causes photoelectrons to be ejected, it may consist of

Two identical metal plates shown photoelectric effect by a light of wavelength $\lambda \mathop A\limits^ \circ$ falls on plate A and ${\lambda _B}$ on plate $B\left( {{\lambda _A} = 2{\lambda _B}} \right).$ The maximum kinetic energy is

If a photon has velocity $c$ and frequency $v,$ then which of following represents its wavelength

If a photon has velocity $c$ and frequency $v,$ then which of following represents its wavelength

The energy of a photon of light with wavelength $5000\;\mathop A\limits^ \circ$ is approximately $2.5\;eV.$ This way the energy of an $X$-ray photon with wavelength $1\mathop A\limits^ \circ$would be

The wavelength of a 1 keV photon is $1.24 imes {10^{ - 9}}$m. What is the frequency of 1 MeV photon?