Dual Nature Of Radiation - Modern Physics PYQ

The de-Broglie wavelength associated with a proton under the influence of an electric potential of 100 V 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 photoelectron, the number of photoelectrons emitted from an area of \(2 \mathrm{~cm}^2\) of the surface is nearly

If a photocell is illuminated with a radiation of 1240 \(\mathop A\limits^o\), the stopping potential is found to be 8V. Then, the work-function of the emitter and the threshold wavelength are

The graph between the maximum speed \((v_{max})\) of a photoelectron and frequency \((\nu)\) of the incident radiation, in photoelectric effect is correctly represented by

In a photoelectric experiment light of wavelength 800 nm produces photoelectrons with the smallest de-Broglie wavelength of 1 nm . Light of 400 nm produces photoelectrons with smallest de-Broglie wavelength of 0.5 nm. Then the work function of the metal used in the experiment is nearly.

The metal which has the highest work function in the following is

The following statement is correct in the case of photoelectric effect

Light of wavelength $4000\mathop {\rm{A}}\limits^{\rm{o}}$ is incident on a sodium surface for which the threshold wavelength of photoelectrons is $5420 \mathop {\rm{A}}\limits^{\rm{o}}$. The work function of sodium is

The surface of a metal is first illuminated with a light of wavelength 300 nm and later illuminated by another light of wavelength 500 nm . It is observed that the ratio of maximum velocities of photoelectrons in two cases is 3 . The work function of metal value is close to

If the linear momentum of a proton is changed by $p_0$ then the de-Broglie wavelength associated with the proton changes by $0.25 \%$. Then the initial linear momentum of the proton is

If an electron in the excited state falls to ground state, a photon of energy 5 eV is emitted, then the wavelength of the photon is nearly

If the threshold wavelength of light for photoelectric emission to take place from a metal surface is $6250 \mathop {\rm{A}}\limits^{\rm{o}}$, then the work function of the metal is (Planck's constant $=6.6 \times 10^{-34} \mathrm{Js}$ )

A camera is fabricated using a semiconducting material having a band gap of 3 eV . The wavelength of light if can detect is nearly