Sound — Flashcards
Telangana Board · Class 9 · Physical Science
20 flashcards for Sound (Telangana Board Class 9 Physical Science) to test yourself on key terms and facts. Sample: "A boy shouts near a cliff and hears.
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A boy shouts near a cliff and hears an echo after 2 seconds. If the speed of sound is 340 m/s, find the distance to the cliff.
Answer
Distance = Speed × Time ÷ 2 Distance = 340 × 2 ÷ 2 = 340 m We divide by 2 because sound travels to the cliff and back, so total distance is twice the cliff distance.
Why does sound travel faster in solids than in gases?
Answer
Sound travels faster in solids because particles are more closely packed and strongly bonded. This allows vibrations to transfer more quickly from one particle to another. Sound speed in iron (5120 m/…
What happens when you strike a tuning fork and place it near your ear?
Answer
When struck, the tuning fork vibrates at a specific frequency. The vibrating prongs create compressions and rarefactions in air, producing sound waves that travel to your ear. You hear a clear musical…
A sound wave has frequency 500 Hz and wavelength 0.68 m. Calculate its speed.
Answer
Speed = Frequency × Wavelength v = ν × λ v = 500 Hz × 0.68 m = 340 m/s This is the speed of sound in air at room temperature.
Why can't we hear sounds in space?
Answer
Sound needs a medium (solid, liquid, or gas) to travel because it propagates through vibrations of particles. Space is a vacuum with no air or matter, so sound waves cannot propagate. Astronauts commu…
How does a stethoscope work?
Answer
A stethoscope uses multiple reflection of sound. The chest piece picks up heart/lung sounds, which travel through the hollow tubes by repeated reflections. This concentrates and amplifies the sound, a…
What is the difference between compression and rarefaction in a sound wave?
Answer
Compression: Region where air particles are pushed together, creating higher density and pressure. Rarefaction: Region where air particles are spread apart, creating lower density and pressure. These …
A SONAR signal takes 4 seconds to return from the ocean floor. If sound speed in water is 1500 m/s, find the ocean depth.
Answer
Ocean depth = Speed × Time ÷ 2 Depth = 1500 × 4 ÷ 2 = 3000 m = 3 km We divide by 2 because SONAR measures round-trip time (down to ocean floor and back up).
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