A wave has frequency 50 Hz and wavelength 2 m. Its speed is: MCQ with Answer and Explanation

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A wave has frequency 50 Hz and wavelength 2 m. Its speed is:

A. 100 m/s

B. 200 m/s

C. 25 m/s

D. 50 m/s

Answer: Option A

Solution (By JKSSB Mock Tests)

Wave speed v = frequency (f) × wavelength (λ). Thus v = 50 Hz × 2 m = 100 m/s. This fundamental wave equation applies to all periodic waves (sound, light, water). Memory aid: 'v = fλ – the universal wave equation'. Competitive exams frequently test this direct calculation. Always ensure units: Hz = s⁻¹, so (s⁻¹)×m = m/s, correct for speed. This problem assesses basic wave property understanding, crucial for sound and light topics.

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Question #1

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The working principle of a Venturimeter, used to measure the flow rate of a liquid through a pipe, is primarily based on:

A. Stokes' Law

B. Bernoulli's Principle

C. Archimedes' Principle

D. Torricelli's Theorem

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Correct Answer: Option B

Explanation:
A Venturimeter consists of a converging pipe, a narrow throat, and a diverging pipe. As fluid passes through the constricted throat, its velocity increases. According to Bernoulli's principle, this increase in kinetic energy must be accompanied by a strictly corresponding decrease in fluid pressure. By measuring this pressure difference, the flow rate can be precisely calculated.

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