A tuning fork of frequency 170 Hz produces sound waves of wavelength 2m. Calculate speed of sound.
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Which term of the A.P. : 17, 34,. 51, … is 170 ?
Correct answer is (B) 10th
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The wavelength of a photon is `1.4 Å`. It collides with an electron. Its wavelength after collision is `2.0 Å`. Calculate the energy of the scattered
Correct Answer - `4.26 xx 10^(-16) J`
2 Answers 2 views
A room contains air in which the speed of sound is `340m//s.` The walls of the room are made of concrete in which the speed of sound is `1700m//s` (a)
Correct Answer - (a) `sin^(-1) ((1)/(5))`; (b) air
2 Answers 1 views
The Laplace’s correction in the expression for velocity of sound given by Newton is needed because sound waves
Correct answer is (C) propagate adiabatically
2 Answers 2 views
A girl stands 170 m away from a high wall and claps her hands at a steady rate so that each clap coincides
i. When the girl makes 60 claps in 1 minute, the value of speed of is 340 m/s. ii. The girl is at a distance of 226.67 m from the wall...
2 Answers 1 views
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...
2 Answers 1 views
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
A stationary source produces a note of frequency 350 Hz. An observer in a car moving towards the source measures the frequency
Given: n0 = 350 Hz, v = 340 m/s, nA = 370 Hz To find: Speed (vL), Frequency (nA) Formulae: i. When the car moves towards the stationary source then, nA = n0 \((\frac{v+v_s}{v})\) ii. When the car moves away from...
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
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