Embibe Experts Solutions for Chapter: Dual Nature of Matter and Radiation, Exercise 2: Exercise-2

In photoelectric effect, stopping potential depends on

${10}^{-3} \mathrm{W}$ of $5000 \stackrel{\circ }{\mathrm{A}}$ light is directed on a photoelectric cell. If the current in the cell is $0.16 \mu ,$ the percentage of incident photons which produce photoelectrons, is

When a photon of light collides with a metal surface, number of electrons, (if any) coming out is

The electron in a hydrogen atom jumps back from an excited state to ground state, by emitting a photon of wavelength ${\lambda }_0=\frac{16}{15R},$ where $R$ is Rydberg's constant. In place of emitting one photon, the electron could come back to ground state by

Which of the following is/are correct.

When a hydrogen atom, initially at rest emits a photon resulting in transition $n=5\to n=1,$ its recoil speed is about

Two electrons are moving with the same speed $\mathrm{v}.$ One electron enters a region of uniform electric field while the other enters a region of uniform magnetic field, then after sometime if the de-Broglie wavelengths of the two are ${\mathrm{\lambda }}_1$ and ${\mathrm{\lambda }}_2,$ then

An electron with initial kinetic energy of $100 \mathrm{eV}$ is accelerated through a potential difference of $50 V.$ Now the de-Broglie wavelength of electron becomes