Sound is produced by
A) any body
B) vibrating body
C) a body in motion
D) bodies having different shapes
1 Answers
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A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what is the wavelength
Given: n = 1000 kHz = 106 Hz, va = 340 m/s, vw = 1486 m/s To find: Reflected wavelength (λR), Transmitted wavelength (λT), Formula: v = nλ Calculation: In different medium, frequency of sound wave remains same. From formula, Sound is...
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The wavelength of a sound note is 1 m in air and 2.5 m in a liquid. Find the speed of sound in the liquid, if the speed
Given: λa = 1 m, λl = 2.5 m, va = 330 m/s, To find: Speed of sound (vl) Formula: v = nλ Calculation: From formula, Since the frequency n remains the same, va = nλa and vl = nλl ∴ \(\frac{v_l}{v_a}=\frac{λ_l}{λ_a}\) ∴ vl = va \(\frac{λ_l}{λ_a}\) =...
2 Answers 2 views
The velocity of sound in air at 27 °C is 340 m/s. Calculate the velocity of sound in air at 127 °C.
Given: T1 = 27 °C = 27 + 273 = 300 K, v1 = 340 m/s, T2 = 127 °C = 127 + 273 = 400 K To find: Velocity (v2) Formula: \(\frac{v_1}{v_2}=\sqrt{\frac{T_1}{T_2}}\) Calculation: From formula, v2 = v1 \(\sqrt{\frac{T_2}{T_1}}\) = 340, \(\sqrt{\frac{400}{300}}\) =...
2 Answers 1 views
The wavelength of sound in air is 1.5 m and that in liquid is 2 m. If the velocity of sound in air is 330 m/s, the velocity of sound in liquid is
Correct option is: (B) 440 m/’s
2 Answers 6 views
A sound note emitted from a certain source has a velocity of 300 m/s in air and 1050 m/s in water. If the wavelength of sound note in air is 2 m
Correct option is: (C) 7 m
2 Answers 1 views
The speed of sound in air at NTP is 330 m/s. The period of sound wave of wavelength 66 cm is ……………
Correct option is: (D) 0.2 × 10-2 s
2 Answers 15 views
If the velocity of sound in hydrogen is 1248 m/s, the velocity of sound in oxygen is (A) 1248 m/s (B) 624 m/s
Correct option is: (C) 312 m/s
2 Answers 1 views
The characteristic of sound which distinguishes between a shrill sound and a growling sound is
Correct option is A) pitch
2 Answers 1 views
Sound of frequency less than 20 Hz is known as …………….. sound.
Correct option is A) infrasonic
2 Answers 1 views
Echo is a reflected sound, reaches our ear, after direct sound in
B) more than 0.1s
2 Answers 1 views