IAT (IISER) 2024 | Dual Nature of Radiation Question 1 | Physics

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?

1 eV

1.25 eV

1.5 eV

2 eV

IAT (IISER) 2022

MCQ (Single Correct Answer)

-1

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 Physics - Dual Nature of Radiation Question 1 English Option 1

IAT (IISER) 2022 Physics - Dual Nature of Radiation Question 1 English Option 2

IAT (IISER) 2022 Physics - Dual Nature of Radiation Question 1 English Option 3

IAT (IISER) 2022 Physics - Dual Nature of Radiation Question 1 English Option 4

IAT (IISER) 2020

MCQ (Single Correct Answer)

-1

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?

Saturation current doesn't depend on frequency and therefore will be same for red and blue light

Saturation current depends on intensity and therefore will be same for red and blue light

Saturation current for blue colour light is larger than red colour light

Saturation current for blue colour light is smaller than red colour light

Questions Asked from MCQ (Single Correct Answer)

IAT (IISER) 2024 (1) IAT (IISER) 2022 (1) IAT (IISER) 2020 (1)

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