Sound
Karnataka Board · Class 9 · Science
Flashcards for Sound — Karnataka Board Class 9 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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A person claps near a cliff and hears an echo after 2 seconds. If the speed of sound is 340 m/s, what is the distance to the cliff?
Answer
Distance = (Speed × Time) ÷ 2 = (340 × 2) ÷ 2 = 340 m We divide by 2 because sound travels to the cliff and back. The echo travels twice the actual distance to the cliff.
Why can't we hear sound in space (vacuum)?
Answer
Sound requires a medium (solid, liquid, or gas) to travel. It propagates through compressions and rarefactions of particles. In vacuum, there are no particles to vibrate and transmit sound waves, so s…
What happens when you strike a tuning fork and touch a suspended ping-pong ball with it?
Answer
The ping-pong ball moves away from the tuning fork. This demonstrates that the tuning fork is vibrating. The vibrations transfer energy to the ball, causing it to move. This proves that sound is produ…
Why do concert halls have curved ceilings?
Answer
Curved ceilings reflect sound waves uniformly to all parts of the hall. This ensures that sound reaches every corner clearly and evenly. Without proper reflection design, some areas might have poor ac…
Calculate the frequency of a sound wave with wavelength 2 m traveling at 340 m/s in air.
Answer
Using v = λν Frequency (ν) = Speed (v) ÷ Wavelength (λ) ν = 340 ÷ 2 = 170 Hz This frequency is audible to humans (20 Hz to 20,000 Hz range).
What is the difference between compression and rarefaction in a sound wave?
Answer
Compression: Region where air particles are pushed together, creating high pressure and high density. Rarefaction: Region where air particles are spread apart, creating low pressure and low density. S…
How does ultrasound help doctors examine internal organs without surgery?
Answer
Ultrasound waves reflect differently from different tissues. A scanner sends ultrasound into the body and detects reflected waves. These are converted to electrical signals that create images of inter…
Why is sound called a longitudinal wave?
Answer
In longitudinal waves, particles vibrate parallel to the direction of wave propagation. Sound particles move back and forth along the same direction the sound travels, creating compressions and rarefa…
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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