Embibe Experts Solutions for Chapter: Dual Nature of Matter and Radiation, Exercise 1: TS EAMCET - 10 August 2021 Shift 1

A monochromatic source of radiation is operating at $100 \mathrm{W}$ power. The source emits $2\times {10}^{20}$ photons per second. The wavelength of light will be $\left(h=6.67\times {10}^{-34} \mathrm{J} \mathrm{s}\right)$

A potassium chloride crystal has an energy band gap of $6 \mathrm{eV}$. What wavelength of light for which the crystal is completely transparent? (Assume $hc=1242 \mathrm{eV} \mathrm{mm}$)

In the experimental study of photoelectric effect, if $V_0$ is the stopping potential and $v$ is the frequency of the incident light on the metal the slope of graph plotted for $V_0$ Versus $v$ is (where $h,e$ and ${\varphi }_0$ are Planck's constant, charge of electron and work function of the metal respectively.

$1 \mu \mathrm{W}$ of light at $600 \mathrm{nm}$ falls on a metal whose work function is $2 \mathrm{eV}$. The maximum number of electrons that can come out of the metal is

In a photoelectic experiment the incident photons have frequency $\frac{3}{2}v,$ where $v$ is the threshold frequency. The stopping potential is $V.$ If the frequency of the incident photons is changed to $\frac{3}{4}v,$ then the correct statement is

A stream of electrons accelerated by a potential difference $V$ falls on the surface of a metal whose inner potential is $V_i=15 \mathrm{V}$. Then the refractive index of the metal for the electrons accelerated by a potential difference of $V=150 \mathrm{V}$ is

An electron is moving with a speed in a constant magnetic field, it's de-Broglie wavelength (Assume magnetic field is perpendicular to the plane of motion of electron)

An electron accelerated by a potential difference of $V$ posses a de-Broglie wavelength, $\lambda$. If the accelerating potential is increased by a factor, $9$. The de-Broglie wavelength of electron will be approximately