Two vibrating tuning forks produce progressive waves given by y1 = 4 sin 500 πt and y2 = 2 sin 506 πt. Number of beats produced per minute is:
360
180
3
60
A car is moving towards a high cliff. The car driver sounds a horn of frequency ƒ. The reflected sound heard by the driver has a frequency 2ƒ. If v be the velocity of sound, then the velocity of the car, in the same velocity units, will be:
Two waves are approaching each other with a velocity of 20 m/s and frequency n. The distance between two consecutive nodes is:
The speed of a wave in a medium is 760 m/s. If 3600 waves are passing through a point in the medium in 2 min, then their wavelength is:
13.8 m
25.3 m
41.5 m
57.2 m
A wave enters to water from air. In air frequency, wavelength, intensity and velocity are n1, λ1, l1 and v1 respectively. In water the corresponding quantities are n2, λ2, l1and v2 respectively, then:
l1 = l2
n1 = n2
v1 = v2
λ1 = λ2
A 5.5 m length of string has a mass of 0.035 kg. If the tension in the string is 77 N, the speed of a wave on the string is:
110 ms-1
165 ms-1
77 ms-1
102 ms-1
A sonometer wire when vibrated in full length has frequency n. Now it is divided by the help of bridges into a number of segments of lengths l1,l2,l3,... When vibrated these segments have frequencies n1,n2,n3,... then the correct relation is:
n = n1+ n2 + n3 + ..
Two waves of wavelength 50cm and 51 cm produce 12 beats/s. The speed of sound is:
306 m/s
331 m/s
340 m/s
360 m/s
The transverse wave represented by the equation will have :
Amplitude = 4π
Speed of propagation = 5
The wave described by
y = 0.25 sin (10πx - 2πt),
where x and y are in metre and t in second, is a wave travelling with :
-ve x direction with frequency 1 Hz
+ve x direction with frequency π Hz and wavelength λ = 0.2 m
+ve x direction with frequency 1 Hz and wavelength λ = 0.2m
-ve x direction with amplitude 0.25m and wavelength λ = 0.2m.
