Embibe Experts Solutions for Chapter: Dual Nature of Matter and Radiation, Exercise 1: AP EAPCET - 20 Aug 2021 Forenoon

The photoelectric threshold for a certain metal surface is $360 \mathrm{Å}$. If the metal surface is irradiated by a wavelength of $1100 \mathrm{Å}$, the kinetic energy of the emitted photoelectrons is

Radiation of wavelength $300 \mathrm{nm}$ and intensity $100 \mathrm{W} {\mathrm{m}}^{-2}$ falls on the surface of a photosensitive material. If $2\%$ of the incident photons produce photo electron, the number of photoelectrons emitted from an area of $2{ \mathrm{cm}}^2$ of the surface is nearly

The graph between the maximum speed $\left({\mathrm{v}}_{\max }\right)$ of a photoelectron and frequency $\left(v\right)$ of the incident radiation, in photoelectric effect is correctly represented by:

Which year was declared as the International year of physics?

If a photocell is illuminated with a radiation of $1240 \stackrel{\circ }{\mathrm{A}}$, the stopping potential is found to be $8 \mathrm{V}$; then the work function of the emitter and the threshold wavelength are:

An $\alpha$ -particle moves in a circular path of radius $1 \mathrm{cm}$ in a uniform magnetic field of $0.125 \mathrm{T}$. The de Broglie wavelength associated with the $\alpha$ -particle is

An $\alpha$ - particle and a proton are accelerated from rest by the same potential, then the ratio of their de-Broglie wavelengths is ________

The de Broglie wavelength associated with a proton under the influence of an electric potential of $100$ volts is