MHT CET 2025 20th April Morning Shift | Dual Nature of Radiation Question 4 | Physics

A parallel beam of light is incident normally on a plane surface absorbing $50 \%$ of the light and reflecting the rest. If the incident beam carries 90 W of power, the force exerted by it on the surface is ( $\mathrm{C}=$ velocity of light in air $=3 \times 10^8 \mathrm{~m} / \mathrm{s}$ )

$4.5 \times 10^{-7} \mathrm{~N}$

$1.5 \times 10^{-7} \mathrm{~N}$

$3 \times 10^{-7} \mathrm{~N}$

$9 \times 10^{-7} \mathrm{~N}$

MHT CET 2025 19th April Evening Shift

MCQ (Single Correct Answer)

-0

An electron accelerated by a potential difference ' $V$ ' has de-Broglie wavelength ' $\lambda$ '. If the electron is accelerated by a potential difference ' 9 V ', its de-Broglie wavelength will be

$\frac{\lambda}{4.5}$

$\frac{\lambda}{3}$

$\frac{\lambda}{2}$

$\lambda$

MHT CET 2025 19th April Evening Shift

MCQ (Single Correct Answer)

-0

The maximum velocity of the photoelectrons emitted by a metal surface is $9 \times 10^5 \mathrm{~m} / \mathrm{s}$. The value of ratio of charge (e) to mass (m) of the photoelectron is $1.8 \times 10^{11} \mathrm{C} / \mathrm{kg}$. The value of stopping potential in volt is

2.00

2.25

2.50

3.00

MHT CET 2025 19th April Morning Shift

MCQ (Single Correct Answer)

-0

Light of wavelength $\lambda$ strikes a photoelectric surface and electrons are ejected with energy E . If $E$ is to be increased to twice the original value, the wavelength changes to $\lambda_1$

$\lambda_1<\lambda / 2$

$\lambda_1=\lambda$

$\lambda_1>\lambda / 2$

$\lambda_1=\lambda / 2$

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