JEE Main 2023 (Online) 31st January Morning Shift | Dual Nature of Radiation Question 54 | Physics

If a source of electromagnetic radiation having power $$15 \mathrm{~kW}$$ produces $$10^{16}$$ photons per second, the radiation belongs to a part of spectrum is.

(Take Planck constant $$h=6 \times 10^{-34} \mathrm{Js}$$ )

Gamma rays

Radio waves

Micro waves

Ultraviolet rays

JEE Main 2023 (Online) 30th January Evening Shift

MCQ (Single Correct Answer)

-1

An electron accelerated through a potential difference $V_{1}$ has a de-Broglie wavelength of $\lambda$. When the potential is changed to $V_{2}$, its de-Broglie wavelength increases by $50 \%$. The value of $\left(\frac{V_{1}}{V_{2}}\right)$ is equal to

$\frac{3}{2}$

$\frac{9}{4}$

JEE Main 2023 (Online) 30th January Morning Shift

MCQ (Single Correct Answer)

-1

A small object at rest, absorbs a light pulse of power $$20 \mathrm{~mW}$$ and duration $$300 \mathrm{~ns}$$. Assuming speed of light as $$3 \times 10^{8} \mathrm{~m} / \mathrm{s}$$, the momentum of the object becomes equal to :

$$1 \times 10^{-17} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$$

$$0.5 \times 10^{-17} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$$

$$3 \times 10^{-17} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$$

$$2 \times 10^{-17} \mathrm{~kg} \mathrm{~m} / \mathrm{s}$$

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