Bohr radius r_n ∝ MCQ with Answer and Explanation

Bohr radius r_n ∝
A. 1/n²
B.
C. n
D. 1/n
Answer: Option B
Solution (By JKExamLibrary)
Bohr model: r_n = n²a₀ ⇒ r ∝ n². Higher n = larger orbit. Memory tip: 'Bohr: r ∝ n²; E ∝ -1/n²'. Atomic physics relation frequently tested in competitive exams.

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Question #1 Report Error
Which famous physicist correctly formulated the laws of electromagnetic induction mathematically, later synthesizing all known electromagnetic phenomena into four fundamental equations?
A. Heinrich Hertz
B. Michael Faraday
C. André-Marie Ampère
D. James Clerk Maxwell

Correct Answer: Option D


Explanation:
While Faraday performed the groundbreaking experimental work discovering electromagnetic induction, it was James Clerk Maxwell who formalized these discoveries mathematically. Maxwell's equations (a set of four differential equations) elegantly united electricity, magnetism, and optics, proving theoretically that light itself is a propagating electromagnetic wave.

This question belongs to: Science Physics
Question #2 Report Error
The wavelength of a wave is the distance between two consecutive
A. Both B and C
B. Troughs
C. Crest and trough
D. Crests

Correct Answer: Option A


Explanation:
Wavelength is distance between successive crests or successive troughs.

This question belongs to: Science Physics
Question #3 Report Error
A 50 kg person climbs 30 steps each 15 cm high in 10 s. Power (g=10) is
A. 2250 W
B. 300 W
C. 225 W
D. 150 W

Correct Answer: Option C


Explanation:
Height = 30×0.15=4.5 m. Work = 50×10×4.5=2250 J. Power=2250/10=225 W.

This question belongs to: Science Physics