Study of Sound — Flashcards
Maharashtra Board · Class 9 · Science
28 flashcards for Study of Sound (Maharashtra Board Class 9 Science) to test yourself on key terms and facts. Sample: "What is sound and how does it.
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What is sound and how does it propagate?
Answer
Sound is a form of energy that creates the sensation of hearing in our ears. It exists in the form of waves that require a medium for propagation. Sound waves create alternating regions of compression…
What are longitudinal waves? Give an example.
Answer
Longitudinal waves are waves where particles of the medium oscillate parallel to the direction of wave propagation. Sound waves are longitudinal waves because air particles vibrate back and forth in t…
What is the difference between transverse and longitudinal waves?
Answer
In transverse waves, particles oscillate perpendicular to wave propagation (like water waves). In longitudinal waves, particles oscillate parallel to wave propagation (like sound waves). Sound is alwa…
Define wavelength (λ), frequency (ν), amplitude (A), and time period (T) for sound waves.
Answer
Wavelength (λ): Distance between two consecutive compressions or rarefactions. Frequency (ν): Number of oscillations per second. Amplitude (A): Maximum displacement from mean position, determines loud…
What determines the pitch and loudness of a sound?
Answer
Pitch is determined by frequency (ν) - higher frequency means higher pitch. Loudness is determined by amplitude (A) - greater amplitude means louder sound. These are independent properties of sound wa…
Write the formula for velocity of sound and explain each term.
Answer
v = νλ (velocity = frequency × wavelength) or v = λ/T (velocity = wavelength/time period). Where v is velocity, ν is frequency, λ is wavelength, and T is time period. Since ν = 1/T, both formulas are …
In which medium does sound travel fastest: solids, liquids, or gases? Why?
Answer
Sound travels fastest in solids, slower in liquids, and slowest in gases. This is because particles in solids are more tightly packed, allowing vibrations to transfer more efficiently from one particl…
How does temperature affect the velocity of sound in gases?
Answer
Velocity of sound in gases is directly proportional to the square root of temperature (v ∝ √T). This means if temperature increases 4 times, velocity doubles. At 22°C, sound velocity in air is about 3…
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