Dual Nature of Radiation · Physics · IAT (IISER)
MCQ (Single Correct Answer)
1
A particle of mass $m$ and charge $q$ is accelerated through a distance $d_1$ by an electric field $\vec{E}$. Another particle of mass $M$ and charge $q$ is accelerated by the same electric field through a distance $d_2$. Both the particles emerge with the same de Broglie wavelength $\lambda_B$. What is the ratio of the distances $d_2 / d_1$ ?
IAT (IISER) 2025
2
Two monochromatic sources emit light at wavelengths $\lambda$ and $\lambda / 2$. The stopping potentials for a photosensitive material using these two sources are found to be 1 V and 3 V , respectively. What is the work function of the material?
IAT (IISER) 2024
3
The figures in the options show the photocurrent $J$ of a photoelectric material versus the frequency $f$ of an incident light beam. The light beam can have three different intensities $I_1, I_2, I_3$, with $I_3>I_2>$ $I_1$. Which of the options is correct?
IAT (IISER) 2022
4
In the photoelectric effect experiment, the frequency of the incident light is changed from red to blue while keeping the energy per unit area per unit time of the incident radiation fixed. What will happen to the saturation current?
IAT (IISER) 2020