1
JEE Main 2024 (Online) 31st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
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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
quadrupled
2
JEE Main 2024 (Online) 31st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
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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
MCQ (Single Correct Answer)
+4
-1
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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

JEE Main 2024 (Online) 30th January Evening Shift Physics - Dual Nature of Radiation Question 15 English

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
MCQ (Single Correct Answer)
+4
-1
Change Language

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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