NEET Physics Question - Modern Physics - Photoelectric Effects and deBroglie Equation

Assertion (A): An electron microscope is based on de Broglie's hypothesis of matter waves.

Reason (R): Higher the accelerating potential, smaller is the de Broglie wavelength of the electron.

(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)

(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(3) (A) is true but (R) is false

(4) Both (A) and (R) are false

Solution:

Assertion (A) is true: Electron microscopes utilize the wave nature of electrons. Reason (R) is true: de Broglie wavelength \(\lambda = h/\sqrt{2meV}\) decreases with higher potential (V). R explains A, as smaller wavelength allows better resolution.

Rankers Physics

Electron Microscope & de Broglie Wavelength

Solution:

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