1
NEET 2025
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following options represent the variation of photoelectric current with property of light shown on the x-axis?

NEET 2025 Physics - Dual Nature of Radiation and Matter Question 1 English 1 NEET 2025 Physics - Dual Nature of Radiation and Matter Question 1 English 2 NEET 2025 Physics - Dual Nature of Radiation and Matter Question 1 English 3 NEET 2025 Physics - Dual Nature of Radiation and Matter Question 1 English 4
A
A and D
B
B and D
C
A only
D
A and C
2
NEET 2025
MCQ (Single Correct Answer)
+4
-1
Change Language

A photon and an electron (mass $m$ ) have the same energy $E$. The ratio ( $\lambda_{\text {photon }} / \lambda_{\text {electron }}$ ) of their de Broglie wavelengths is: ( $c$ is the speed of light)

A
$c \sqrt{\frac{2 m}{E}}$
B
$\frac{1}{c} \sqrt{E / 2 m}$
C
$\sqrt{E / 2 m}$
D
$c \sqrt{2 m E}$
3
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1
Change Language

An electron and an alpha particle are accelerated by the same potential difference. Let $$\lambda_e$$ and $$\lambda_\alpha$$ denote the de-Broglie wavelengths of the electron and the alpha particle, respectively, then:

A
$$\lambda_e>\lambda_\alpha$$
B
$$\lambda_e=4 \lambda_\alpha$$
C
$$\lambda_e=\lambda_\alpha$$
D
$$\lambda_e<\lambda_\alpha$$
4
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1
Change Language

If $$\phi$$ is the work function of photosensitive material in $$\mathrm{eV}$$ and light of wavelength of numerical value $$\lambda=\frac{h c}{e}$$ metre, is incident on it with energy above its threshold value at an instant then the maximum kinetic energy of the photo-electron ejected by it at that instant (Take $$h$$-Plank's constant, $$c$$-velocity of light in free space) is (in SI units):

A
$$e+2 \phi$$
B
$$2 e-\phi$$
C
$$e-\phi$$
D
$$e+\phi$$
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