1
JEE Main 2024 (Online) 31st January Evening Shift
+4
-1

In a photoelectric effect experiment a light of frequency 1.5 times the threshold frequency is made to fall on the surface of photosensitive material. Now if the frequency is halved and intensity is doubled, the number of photo electrons emitted will be:

A
doubled
B
halved
C
Zero
D
2
JEE Main 2024 (Online) 31st January Morning Shift
+4
-1

When a metal surface is illuminated by light of wavelength $$\lambda$$, the stopping potential is $$8 \mathrm{~V}$$. When the same surface is illuminated by light of wavelength $$3 \lambda$$, stopping potential is $$2 \mathrm{~V}$$. The threshold wavelength for this surface is:

A
3$$\lambda$$
B
9$$\lambda$$
C
5$$\lambda$$
D
4.5$$\lambda$$
3
JEE Main 2024 (Online) 30th January Evening Shift
+4
-1

For the photoelectric effect, the maximum kinetic energy $$\left(E_k\right)$$ of the photoelectrons is plotted against the frequency $$(v)$$ of the incident photons as shown in figure. The slope of the graph gives

A
Planck's constant
B
Work function of the metal
C
Charge of electron
D
Ratio of Planck's constant to electric charge
4
JEE Main 2024 (Online) 30th January Evening Shift
+4
-1

If the total energy transferred to a surface in time $$\mathrm{t}$$ is $$6.48 \times 10^5 \mathrm{~J}$$, then the magnitude of the total momentum delivered to this surface for complete absorption will be:

A
$$2.16 \times 10^{-3} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$$
B
$$2.46 \times 10^{-3} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$$
C
$$1.58 \times 10^{-3} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$$
D
$$4.32 \times 10^{-3} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$$
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