Who formulated the Planetary Model of the atom, proposing that electrons orbit the nucleus in specific, quantized circular orbits? MCQ with Answer and Explanation

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Who formulated the Planetary Model of the atom, proposing that electrons orbit the nucleus in specific, quantized circular orbits?

A. Niels Bohr

B. Albert Einstein

C. J. J. Thomson

D. Ernest Rutherford

Answer: Option A

Solution (By JKExamLibrary)

Niels Bohr proposed the Bohr model of the atom in 1913. He improved upon Rutherford's model by introducing quantum theory, suggesting that electrons travel in discrete, quantized orbits around the nucleus without radiating energy, and that energy is only emitted or absorbed when an electron jumps between these specific orbits.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The latent heat of fusion of ice is 80 cal/g. Heat required to melt 50 g ice at 0°C is

A. 1600 cal

B. 800 cal

C. 40 cal

D. 4000 cal

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Correct Answer: Option D

Explanation:
Q = mL = 50 × 80 = 4000 cal. (1 cal = 4.2 J, but here in cal). No temperature change during phase change. Latent heat of vaporization is 540 cal/g for water.

This question belongs to: Science Physics

Question #2 Report Error

The fundamental principle utilized in an optical endoscope, which allows doctors to examine the inside of the human body, is:

A. Scattering of light

B. Diffraction of light

C. Polarization of light

D. Total internal reflection of light

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Correct Answer: Option D

Explanation:
Endoscopes consist of bundles of flexible optical fibers. Light introduced at one end is trapped inside the fiber core because it repeatedly strikes the boundary at an angle greater than the critical angle. This Total Internal Reflection allows light and visual images to be transmitted through complex, curving paths inside the body.

This question belongs to: Science Physics