Sound
ICSE · Class 10 · Physics
Flashcards for Sound — ICSE Class 10 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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Explore the full setState the audible range of human ears.
Answer
Human ears are sensitive to a limited range of frequencies from 20 Hz to 20,000 Hz. Sound below 20 Hz is infrasonic and sound above 20,000 Hz is ultrasonic.
Why are sound waves called mechanical waves?
Answer
Sound waves need a material medium for propagation. They travel through air, water, or solids, so they are mechanical waves. They cannot travel in vacuum.
State the relation between wave velocity, frequency, and wavelength.
Answer
Formula: v = f × λ Meaning: v = wave velocity, f = frequency, λ = wavelength. Unit check: m/s = Hz × m. Quick example: If f = 10 Hz and λ = 2 m, then v = 20 m/s.
A sound wave has frequency 50 Hz and wavelength 6.6 m. Find its speed.
Answer
Given: f = 50 Hz, λ = 6.6 m Formula: v = f × λ Step 1: v = 50 s⁻¹ × 6.6 m Step 2: v = 330 m/s Answer: Speed of sound = 330 m/s…
State the relation between frequency and time period.
Answer
Formula: f = 1/T Meaning: f = frequency, T = time period. Unit check: Hz = 1/s. Quick example: If T = 0.2 s, then f = 1/0.2 = 5 Hz.
A wave completes 4 oscillations in 2 seconds. Find its frequency and time period.
Answer
Given: oscillations = 4, time = 2 s Frequency: f = number of oscillations / time Step 1: f = 4/2 = 2 Hz Time period: T = 1/f Step 2: T = 1/2 = 0.5 s Answer: Frequency = 2 Hz, time period = 0.5 s…
Why do sound waves travel as longitudinal waves?
Answer
In sound waves, particles of the medium vibrate to and fro parallel to the direction of wave travel. This creates compressions and rarefactions, so sound waves are longitudinal in nature.
State the difference between light waves and sound waves.
Answer
Light waves are electromagnetic and transverse in nature. Sound waves are mechanical and longitudinal in nature. Light can travel in vacuum, but sound requires a medium. Speed of light in air is 3 × 1…
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