JEE Main 2023 (Online) 25th January Morning Shift | Dual Nature of Radiation Question 48 | Physics

Electron beam used in an electron microscope, when accelerated by a voltage of 20 kV, has a de-Broglie wavelength of $$\lambda_0$$. IF the voltage is increased to 40 kV, then the de-Broglie wavelength associated with the electron beam would be :

3 $$\lambda_0$$

9 $$\lambda_0$$

$$\frac{\lambda_0}{\sqrt2}$$

$$\frac{\lambda_0}{2}$$

JEE Main 2023 (Online) 24th January Evening Shift

MCQ (Single Correct Answer)

-1

An $$\alpha$$-particle, a proton and an electron have the same kinetic energy. Which one of the following is correct in case of their de-Broglie wavelength:

$${\lambda _\alpha } > {\lambda _p} < {\lambda _e}$$

$${\lambda _\alpha } > {\lambda _p} > {\lambda _e}$$

$${\lambda _\alpha } = {\lambda _p} = {\lambda _e}$$

$${\lambda _\alpha } < {\lambda _p} < {\lambda _e}$$

JEE Main 2023 (Online) 24th January Morning Shift

MCQ (Single Correct Answer)

-1

From the photoelectric effect experiment, following observations are made. Identify which of these are correct.

A. The stopping potential depends only on the work function of the metal.

B. The saturation current increases as the intensity of incident light increases.

C. The maximum kinetic energy of a photo electron depends on the intensity of the incident light.

D. Photoelectric effect can be explained using wave theory of light.

Choose the correct answer from the options given below :

A, B, D only

A, C, D only

B, C only

B only

JEE Main 2022 (Online) 29th July Evening Shift

MCQ (Single Correct Answer)

-1

An $$\alpha$$ particle and a proton are accelerated from rest through the same potential difference. The ratio of linear momenta acquired by above two particles will be:

$$\sqrt2$$ : 1

2$$\sqrt2$$ : 1

4$$\sqrt2$$ : 1

8 : 1

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