The speed of a wave in a certain medium is 960 m/sec. If 3600 waves pass over a certain point of the medium in 1 minute, the wavelength is
A plane wave is described by the equation y=3cos (x/4-10t-π/2)
. The maximum velocity of the particles of the medium due to this wave is
The equation of a wave travelling in a string can be written as y = 3 cosπ (100 t – x) Its wavelength is
The equation of a wave travelling on a string is y = 4 sin π/2(8t-x/8) if x and y are in cm, then velocity of wave is
The equation of wave is y = 2 sin π(0.5x-200t) where x and y are expressed in cm and t in sec. The wave velocity is
On sounding tuning fork A with another tuning fork B of frequency 384 Hz, 6 beats are produced per second. After loading the prongs of A with wax and then sounding it again with B, 4 Beats are produced per second what is the frequency of the tuning fork A
Beats are produced with the help of two sound waves on amplitude 3 and 5 units. The ratio of maximum to minimum intensity in the beats is
When two sound waves with a phase difference of π/2 and each having amplitude A and frequencyω are superimposed on each other, then the maximum amplitude and frequency of resultant wave is
There is a destructive interference between the two waves of wavelength λ coming from two different paths at a point. To get maximum sound or constructive interference at that point, the path of one wave is to be increased by
A tuning fork F1 has a frequency of 256 Hz and it is observed to produce 6 beats/second with another tuning fork F2. When F2 is loaded with wax. It still produces 6 beats/second with F1. The frequency of F2 before loading was
A source of sound of frequency 90 vibration/sec is approaching a stationary observer with a speed equal to 1/10 the speed of sound. What will be the frequency heard by the observer
A motor car blowing a horn of frequency 124 vibration/sec moves with a velocity 72 km/hr towards a tall wall. The frequency of the reflected sound heard by the driver will be (velocity of sound in air is 330 m/s)
The source of sound s is moving with a velocity 50 m/s towards a stationary observer. The observer measures the frequency of the source as 1000 Hz. What will be the apparent frequency of the source when it is moving away from the observer after crossing him ? The velocity of sound in the medium is 350 m/s
A source and listener are both moving towards each other with speed v/10 where v is the speed of sound. If the frequency of the note emitted by the source is f, the frequency heard by the listener would be nearly
An electromagnetic radiation has an energy 14.4 KeV. To which region of electromagnetic spectrum does it belong
Two waves travelling along same direction on the same string have equations:
y1 = A1sin(ωt - kx + Φ1)
y2 = A2sin(ωt - kx + Φ2)
If A1> A2 and φ1> φ2, then according to the principle of superposition, the resultant wave has an amplitude A such that
A wave on a string passes the point x = 0 with amplitude A0, angular frequency ω0 and average rate of energy transfer P0. As the wave travels down the string it gradually loses energy and at the point x = l the average rate of energy transfer becomes . At the point x = £angular frequency and amplitude are respectively:
Three waves, all having the same amplitude and wavelength, travel along a string in the same direction. One of the wave has phase constant of 45°. The phase constants of the other waves, if all three together produce fully destructive interference, are:
In a sound wave, to increase the intensity by a factor of 10, pressure amplitude must be changed by a factor of:
A sound wave of wavelength λ travels towards the right horizontally with a velocity V. It strikes and reflects from a vertical plane surface, travelling at a speed v towards the left. The number of positive crests striking in a time interval of three seconds on the wall is
Two waves represented by y1 = 10 Sin (2000 π t) and y2 = 10 sin (2000 π t + π/2) are superposed at any point at a particular instant. The resultant amplitude is
When two simple harmonic motions of same periods, same amplitude, having phase of 3π/2, and at right angles to each other are super imposed, the resultant wave form is a
A line source emits a cylindrical wave. If the medium absorbs no energy, the amplitude will vary with distance r from the source as proportional to
A transverse wave is described by the equation y = y0 sin 2π (ft – x/a). The maximum particle velocity is equal to four times the wave velocity if a is equal to (a wavelength )
A flat horizontal platform moves up and down in S.H.M. with an amplitude of 1 cm. A small object is placed on the platform. What is the maximum frequency the platform can have, if the object is not to separate from it during any part of the motion ?
