Which of the following statements is wrong?
Sound travels in straight line
Sound is a form of energy
Sound travels in the form of waves
Sound travels faster in vacuum than in air
The relation between frequency ‘n’ wavelength ‘(’ and velocity of propagation ‘v’ of wave is ____.
Ultrasonic, Infrasonic and audible waves travel through a medium with speeds and respectively, then ____.
The distance between two consecutive crests in a wave train produced in a string is 5 cm. If 2 complete waves pass through any point per second, the velocity of the wave is ____.
10 cm /s
2.5 cm /s
5 cm / s
15 cm / s
A tuning fork makes 256 vibrations per second in air. When the velocity of sound is 330 m / s, then wavelength of the tone emitted is ____.
0.56 m
0.89 m
1.11 m
1.29 m
A man sets his watch by a whistle that is 2 km away. How much will his watch be in error?
3 seconds fast
3 seconds slow
6 seconds fast
6 seconds slow
When a sound wave of frequency 300 Hz passes through a medium the maximum displacement of a particle of the medium is 0.1 cm. The maximum velocity of the particle is equal to ____.
60 ( cm /s
30 ( cm /s
30 cm /s
60 cm /s
Sound waves have the following frequencies that are audible to human beings ____.
5 c / s
27000 c / s
5000 c / s
50,000 c / s
Velocity of sound waves in air is 330 m /s. For a particular sound in air, a path difference of 40 cm is equivalent to a phase difference of 1.6(. The frequency of this wave is _____.
165 Hz
150 Hz
660 Hz
330 Hz
The wavelength of ultrasonic waves in air is of the order of ____.
The relation between phase difference ((() and path difference ((x) is ____.
A hospital uses an ultrasonic scanner to locate tumors in a tissue. The operating frequency of the scanner is 4.2 MHz. The speed of sound in a tissue is 1.7 km-s–1. The wavelength of sound in the tissue is close to ____.
The minimum audible wavelength at room temperature is about ____.
0.2 Å
5 Å
5 cm to 2 metre
20 mm
The ratio of the speed of sound in nitrogen gas to that in helium gas, at 300 K is ____.
In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is 0.170 second. The frequency of the wave is ____.
1.47 Hz
0.36 Hz
0.73 Hz
2.94 Hz
The number of waves contained in unit length of the medium is called ____.
elastic wave
wave number
wave pulse
electromagnetic wave
The frequency of a rod is 200 Hz. If the velocity of sound in air is , the wavelength of the sound produced is ____.
1.7 cm
6.8 cm
1.7 m
6.8 m
Frequency range of the audible sounds is ____.
0 Hz – 30 Hz
20 Hz – 20 kHz
20 kHz – 20,000 kHz
20 kHz – 20 MHz
In a medium sound travels 2 km in 3 s and in air, it travels 3 km in 10 s. The ratio of the wavelengths of sound in the two media is ____.
1 : 8
1 : 18
8 : 1
20 : 9
A stone is dropped into a lake from a tower 500 metre high. The sound of the splash will be heard by the man approximately after ____.
11.5 seconds
21 seconds
10 seconds
14 seconds