Acoustics

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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…

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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…

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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…

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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…

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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 …

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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…

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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 …

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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…