JEE Main 2023 (Online) 30th January Evening Shift | Dual Nature of Radiation Question 43 | Physics

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 :

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

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

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

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

JEE Main 2023 (Online) 29th January Evening Shift

MCQ (Single Correct Answer)

-1

The ratio of de-Broglie wavelength of an $$\alpha$$ particle and a proton accelerated from rest by the same potential is $$\frac{1}{\sqrt m}$$, the value of m is -

JEE Main 2023 (Online) 29th January Morning Shift

MCQ (Single Correct Answer)

-1

The threshold wavelength for photoelectric emission from a material is 5500 $$\mathop A\limits^o $$. Photoelectrons will be emitted, when this material is illuminated with monochromatic radiation from a

A. 75 W infra-red lamp

B. 10 W infra-red lamp

C. 75 W ultra-violet lamp

D. 10 W ultra-violet lamp

Choose the correct answer from the options given below :

C only

A and D only

C and D only

B and C only

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