1: What are the wavelengths of a television station which transmits vision or 500 MHz and sound on 505 MHz respectively? Take speed of electromagnetic waves as 3 ｘ 10⁸ m s⁻¹. (60.0 cm, 59.4 cm.)
2: A person on the sea shore observes that 48 waves reach the shore in one minute. If the wavelength of the waves is 10 m, then find the velocity of the waves. (8 m s⁻¹)
3: In a ripple tank 500 waves passes through a certain point in 10 s, if the speed of the wave is 3.5 m s⁻¹, then find the wavelength of the waves. (7 cm.)
4: A string of a guitar 1.3 m long vibrates with 4 nodes, 2 of them at the two ends. Find the wavelength & speed of the wave in the string if it vibrates at 500 Hz. (𝝀=0.866m, v = 433 m s⁻¹)
5: A tension of 400 N causes a 300 g wire of length 1.6 m to vibrate with a frequency of 40 Hz. What is the wavelength of the transverse waves? (1.15m)
6: Compare the theoretical speeds of sound in hydrogen (`\M_H` = 2.0 g/mol, `\Ɣ_H` =1.4) with helium (`\M_{He}` = 4.0 g mol⁻¹, `\Ɣ_{He}` = 1.66 & R = 8334 j k⁻¹ mol⁻¹) at 0°C .
( `\v_He` = 0.77 `\v_H`)
7: The speed of sound in air at 0°C is 332 m s⁻¹. What will be the speed of sound at 22 C? (345.2 m s⁻¹)
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8: Two tuning forks P and Q give 4 beats per second. On loading Q Lightly with wax, we get 3 beats per second. What is the frequency of Q before and after loading if the frequency of P is 512 Hz? (516 Hz, 515Hz)
9: On a sunny day, the sound in the air is 340 m s⁻¹, 2 tuning forks A & B are sounded simultaneously. The wave length of the sounds emitted are 1.5 m and 1.68 m respectively. How many beats will produce per second? (24 beats approx.)
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10: A sound source vibrates at 200 Hz and is receding from a stationary observer at 18 ms⁻¹. If the speed of sound is 331 ms⁻¹ then what frequency does the observer hear? (189.68Hz)
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11: Suppose a train that has a 150-Hz horn is moving at 35.0 m/s in still air on a day when the speed of sound is 340 m/s. (a) What frequencies are observed by a stationary person at the side of the tracks as the train approaches and after it passes? (b) What frequency is observed by the train's engineer traveling on the train? (167Hz, 136Hz)
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12: The first overtone of an open organ pipe has the same frequency as the first overtone of a closed pipe 3.6 m in length. What is the length of the open organ pipe? (4.8m)
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13: What length of open pipe will produce a frequency of 1200 Hz as its first overtone on a day when the speed of sound is 340 m s⁻¹ (28.3cm)
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1. Website for School and College Level Physics
2. Website for School and College Level Mathematics
3. Website for Single National Curriculum Pakistan - 5th Class Notes
© 2020-21 Academic Skills and Knowledge (ASK)
Note: Write me in the comments box below for any query and also Share this information with your class-fellows and friends.
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