2) A tuning fork of frequency 500 Hz is used to produce transverse waves in a string. The distance between two consecutive crest is 10cm. Find velocity of wave. 50m/s
3) A sound of wavelength 68cm travels 850m in 2.5sec. Find
A) velocity of sound. 340m/sec
B) frequency of sound. 500Hz
4) Draw a figure representing wave of
A) amplitude 4m
B) wavelength 2m if frequency of wave is 150Hz. Find its velocity. 300m/sec
5) When a stone is thrown in a pond, 10 ripples are produced in one sec. If the distance between a crest and a trough is 10cm, find
A) frequency. 10Hz
B) wave velocity. 200cm/sec
C) wavelength of ripple. 20cm
6) Calculate the wavelength, in air, of a note of frequency 400Hz when the velocity of sound in air is 330m/sec.
0.825m.
7) A tuning fork has a frequency of 512Hz, and it produces a sound wave of wavelength 0.65m. Calculate the velocity of sound wave in air. 332.8m/sec.
8) The lowest pitch detectable as sound by an average human ear corresponds to 20Hz, and the highest to about 20000Hz. What is the wavelength of each in air ? Take velocity of sound as 330m/sec. 16.5m, 0.0165m
9) A simple pendulum of length 50cm executes 30 oscillations in 42.6sec. Find the value of acceleration due to gravity at the place. 9.78m/sec²
10) Frequency of a wave motion is 500Hz. Find out its time period. 0.002sec.
11) The wavelength of sound emitted by a source is 1 7/10²m. Calculate the frequency of sound, if its velocity is 443.4m/sec. 20200Hz.
12) Sound waves travels with a speed of about 330m/sec. What is the wavelength of sound whose frequency is 550Hz? 0.6
13) A longitudinal wave of wavelength 1cm, travels in aur with a speed of 330m/sec. Find the frequency of wave.
33000Hz
14) In a ripple tank, 10 full ripples/sec are produced. The distance between a trough and a crest is 15cm. Calculate
A) the frequency. 10Hz
B) the wavelength. 30cm
C) velocity of ripples. 3m/sec
15) A source of sound produces waves of wavelength 0.80m in air. The same source of sound produces wave of wavelength 4.0n in water. If the velocity of sound in air is 332m/sec, find the velocity of sound in water.
1660m/sec
16) If the ratio of the length of two pendulums is 4:9, find the corresponding ratio of their time periods. 2:3
17) A man stands at a distance from a wall and sets up a simple pendulum which makes two vibrations per sec. He claps his hands and hears the echo after exactly one complete oscillation of the pendulum. Find the distance between the man and the wall. 170m.
18) A) If the frequency and wavelength of a certain sound are 256Hz and 1.3m respectively. Find speed of sound. 332.8m
B) if another sound, travelling with the same speed where to have a wavelength of 2.6m, what difference would it make to a listner. 128Hz
1. The speed of sound at 4° C is 322.4m/s. Calculate the speed of sound at 34° C. 340.4 m/s
2. The speed of sound at -5°C is 317m/s. Calculate the speed of sound at
a) 35°C. 341 m/s
b) - 45°C. 293 m/s
3. The speed of sound at 0°C 320 m/s. Calculate the temperature when speed of sound.
a) Increases by 1/8th of speed of sound at 0°C. 66.67°C
b) Decreases by 1/12th of speed of sound at 0°C. 44.45°C
4. The speed of sound at 10°C is 326 m/s. Calculate the temperature at which speed of sound is 302 m/s. -30°C.
5. A sound wave frequency 640 Hz travels 800 m in 2.5 s. Calculate
a) speed of the sound. 320m/s
b) wavelength of sound wave.
0.5 m
6. A television station broadcasts at a frequency of 4500 MHz. If the speed of television waves is 3x10⁸ m/s. Calculate the wavelength of television waves. 0.067m
7. A longitudinal wave of wavelength 0.03 cm travels in air with a speed of 330 m/s. Calculate the frequency of the wave. Can this wave be heard by a normal human ear . Give a reason for your answer.
1100000Hz
8) A sound wave has a frequency of 2000 Hz and wavelength 17cm. If the wavelength increases to 51cm. what is the frequency, the nature of material through which sound is propagation remains the same
666.67 Hz
9. A disturbance in air has wavelength of 22 metre and speed 330m/s. Calculate the frequency of disturbance. State whether above disturbance is audible to normal human ear. give one reason for your answer.
15 Hz
10. An ultraviolet radiation has wavelength 150 A°. If the speed of ultraviolet radiation is 3x10⁸ m/s. calculate
A. frequency of radiation in MHz
B. Time period (1 A°= 1/10¹⁰)
2x10¹⁰MHz, 5/10¹⁷ sec.
11. The wavelength of waves produced on the surface of water is 20cm. if the wave velocity is 24 m/s, calculate
A) number of waves produced in one second. 120Hz
B) Time required to produce one wave. 8.33/10³
12. A thin metal plate is placed against the teeth of cog wheel. If the cog wheel is rotated at a constant speed of 360 rotations per minute and has 80 teeth. calculate
A) frequency of a note produced
B) speed of sound, if the wavelength is 0.7m.
C) What will be the effect, if the speed of the coh wheel is halved?
480Hz, 336.0 m/s
13. A vibrating turning fork can produce note of wavelength 0.83m and has a time period of 2.5/10³ seconds. calculate the wave velocity note and the distance covered by sound wave in 0.08s. 26.56 m
14. The distance between one crest and one through produced on the surface of water is 0.04m. If the waves are produced at a rate of 180 per minute . Calculate a) time period 0.33s
b) wave velocity. 0.24 m/s
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