A bucket full of hot water is kept in a room. It cools from 75°C to 70°C in t1 minutes, from 70°C to 65°C in t2 minutes and from 65°C to 60°C in t3 minutes. Then
t1 < t2 < t3
t1 = t2 = t3
t1 < t2 > t3
t1 > t2 > t3
The equation of a transverse wave travelling along positive X-axis with amplitude 0.2 m, velocity 360 m/sec and wavelength 60 m can be written as
If vm is the velocity of sound in moist air, vd is the velocity of sound in dry air, under identical conditions of pressure and temperature.
vm < vd
vm > vd
vmvd = 1
vm = vd
If T is the reverberation time of an auditorium ofvolume V, then
T ∝ V2
T ∝ V
B.
T ∝ V
Reverberation time T is given by
where, V = volume of the hall
A = absorption area of sound in a hall
Hence, T ∝ V
Two wires are fixed in a sonometer. Their tensions are in the ratio 8 : 1. The lengths are in the ratio 36 :35. The diameters are in the ratio 4 : 1. Densities of the materials are in the ratio 1 :2. If the higher frequency in the setting is 360 Hz, the beat frequency when the two wires are sounded together, is
8
5
10
6
A sound source is moving towards stationary listener with th of the speed of sound. The ratio of apparent to real frequency is
If v is the speed of sound in air, then the shortest length of the closed pipe which resonates to a frequency n, is
Cavitation is a special application property exhibited only by
ultrasonics
electromagnetic waves
audible sound
infrasonics
Waves that cannot be polarised are
electromagnetic waves
light waves
longitudinal waves
transverse waves
A charge q is placed at the centre of the line joining two equal point charges each equal to Q. The system of 3 charges will be in equilibrium if q is equal to