A wave has speed 300 m/s and frequency 150 Hz. Wavelength is MCQ with Answer and Explanation

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A wave has speed 300 m/s and frequency 150 Hz. Wavelength is

A. 45000 m

B. 2 m

C. 300 m

D. 0.5 m

Answer: Option B

Solution (By JKSSB Mock Tests)

λ = v/f = 300/150 = 2 m.

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Question #1

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The working of an optical fibre is based on

A. Diffraction

B. Total internal reflection

C. Dispersion

D. Refraction

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Correct Answer: Option B

Explanation:
Light signal travels by repeated total internal reflection.

This question belongs to: Science Physics

Question #2

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Convex lens in water: focal length:

A. Unchanged

B. Becomes negative

C. Increases

D. Decreases

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Correct Answer: Option C

Explanation:
Lens maker: 1/f ∝ (n_rel - 1). In water, n_rel = n_glass/n_water ≈ 1.5/1.33 ≈ 1.13 < 1.5 (air). Smaller (n_rel-1) ⇒ larger f. Memory aid: 'Lens in denser medium: reduced power ⇒ longer focal length'. Optics application frequently tested in competitive exams.

This question belongs to: Science Physics