Acoustics — Flashcards
Tamil Nadu Board · Class 10 · Science
32 flashcards for Acoustics (Tamil Nadu Board Class 10 Science) to test yourself on key terms and facts. Sample: "What is sound and how is it produced?"
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What is sound and how is it produced?
Answer
Sound is produced by vibrations of bodies. When an object vibrates, it creates energy in the form of waves called sound waves. For example, when you strike a drum, the membrane vibrates and produces s…
Why can't we hear sound on the Moon?
Answer
Sound requires a material medium (air, water, or solid) to propagate. The Moon has no atmosphere, so there is no air for sound waves to travel through. Without a medium, vibrations cannot create sound…
Define longitudinal waves and explain how sound travels as longitudinal waves.
Answer
Longitudinal waves are waves where particles of the medium vibrate back and forth along the direction of wave propagation. In sound waves, air molecules compress and spread apart (creating compression…
What are the three categories of sound waves based on frequency, and what are their ranges?
Answer
1. Audible waves: 20 Hz to 20,000 Hz (human hearing range) - produced by vocal cords, musical instruments 2. Infrasonic waves: Below 20 Hz (humans cannot hear) - produced during earthquakes, ocean wav…
A sound has a wavelength of 0.5 m and travels at 340 m/s. What is its frequency?
Answer
Using the formula: v = nλ, where v is velocity, n is frequency, and λ is wavelength. Given: λ = 0.5 m, v = 340 m/s n = v/λ = 340/0.5 = 680 Hz The frequency is 680 Hz, which falls in the audible range …
Why does sound travel faster in solids than in gases?
Answer
Velocity of sound depends on the elasticity and density of the medium. Solids are highly elastic and have tightly bound particles that quickly transmit vibrations. Gases have loosely arranged particle…
How does temperature affect the speed of sound in air?
Answer
The speed of sound in a gas increases with temperature. The relationship is: v_T = (v_0 + 0.61T) m/s, where v_0 is the speed at 0°C and T is temperature in Celsius. For air, v_0 = 331 m/s. This means …
Calculate the speed of sound in air at 20°C if v_0 = 331 m/s at 0°C.
Answer
Using: v_T = (v_0 + 0.61T) m/s Given: v_0 = 331 m/s, T = 20°C v_20 = 331 + (0.61 × 20) v_20 = 331 + 12.2 = 343.2 m/s At room temperature (20°C), sound travels at approximately 343 m/s in air. This exp…
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