Sound
Tamil Nadu Board · Class 9 · Science
Flashcards for Sound — Tamil Nadu Board Class 9 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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Explore the full setWhat is sound and how is it produced?
Answer
Sound is a form of energy that produces the sensation of hearing in our ears. It is produced by vibrations of substances. When an object vibrates, it causes nearby molecules to vibrate, creating sound…
Can sound travel through vacuum? Explain with an example.
Answer
No, sound cannot travel through vacuum. Sound requires a material medium (air, water, steel, etc.) to propagate. The Bell-Jar experiment demonstrates this: when air is pumped out of a jar containing a…
What are compressions and rarefactions in sound waves?
Answer
Compressions are regions where particles of the medium are crowded together (high-pressure areas). Rarefactions are regions where particles are spread apart (low-pressure areas). Sound waves propagate…
What is a longitudinal wave? Why is sound considered a longitudinal wave?
Answer
A longitudinal wave is one where particles of the medium vibrate back and forth along the direction of wave propagation. Sound is a longitudinal wave because sound particles move to and fro in the sam…
Define amplitude of a sound wave and how it relates to loudness.
Answer
Amplitude (A) is the maximum displacement of particles from their equilibrium position when a wave passes through. Large amplitude = loud sound, Small amplitude = soft sound. If you strike a table lig…
What is frequency of sound? What is the audible range for humans?
Answer
Frequency (n) is the number of complete vibrations (cycles) produced in one second. SI unit: Hz (hertz) or s⁻¹. Audible range for humans: 20 Hz to 20,000 Hz. Sound below 20 Hz = Infrasonic (humans can…
Explain time period and its relationship with frequency.
Answer
Time period (T) is the time required to produce one complete vibration or cycle. SI unit: second (s). Frequency and time period are reciprocal to each other: T = 1/n or n = 1/T. If frequency = 100 Hz,…
What is wavelength? How is it measured in sound waves?
Answer
Wavelength (λ, lambda) is the minimum distance in which a sound wave repeats itself. It can also be defined as the distance between the centers of two consecutive compressions or two consecutive raref…
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