Mechanics
Units & Measurement and DimensionsMotion in a Straight LineLaws of MotionCircular MotionWork, Energy and PowerRotational MotionGravitationSimple Harmonic MotionFluid MechanicsWavesHeat and ThermodynamicsOptics
Ray OpticsElectromagnetism
ElectrostaticsCurrent ElectricityCapacitorMoving Charges and MagnetismElectromagnetic InductionAlternating CurrentElectromagnetic WavesModern Physics
Atoms and NucleiDual Nature of RadiationSemiconductor Devices and Logic GatesDual Nature of Radiation
Practice QuestionsMCQ (Single Correct Answer)
1
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
2
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
3
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