Physics-
General
Easy
Question
The minimum deviation produced by a hollow prism filled with a certain liquid to be 30° The light ray is also found to be refracted at angle 30° The refractive index of the liquid is
The correct answer is:
Related Questions to study
Physics-
A Boat is travelling in a river with a speed 10 m/s along the stream flowing river through a rigid support. The wave length of the sound emitted from the transmitter inside the water is 14.45 mm. Assume that attenuation of sound in water and air is negligible (Temp of air & water =20°C. Density of river 
mean molecular wt of air =
and 
of air =1.4) Find frequency of sound detected by the receiver in air :
A Boat is travelling in a river with a speed 10 m/s along the stream flowing river through a rigid support. The wave length of the sound emitted from the transmitter inside the water is 14.45 mm. Assume that attenuation of sound in water and air is negligible (Temp of air & water =20°C. Density of river mean molecular wt of air = and of air =1.4) Find frequency of sound detected by the receiver in air :
Physics-General
Physics-
As shown in the figure two sources producing sound 
and 
(velocity of sound 360 m/sec ) each producing sound of frequency 200 Hz is rotating anti clock wise where as is approaching observer O each with a speed 10 m/sec. (neglect radius of circular path of 
), then calculate
Range of number of beats received by observer O at rest is (nearly)
As shown in the figure two sources producing sound and (velocity of sound 360 m/sec ) each producing sound of frequency 200 Hz is rotating anti clock wise where as is approaching observer O each with a speed 10 m/sec. (neglect radius of circular path of ), then calculate
Range of number of beats received by observer O at rest is (nearly)
Physics-General
Physics-
By observing an alternating Doppler shift of a spectral line, the astronomers can deduce the existence of a binary star system, which otherwise cannot be resolved visually. Suppose that an astronomical observation shows that the source of light is eclipsed once every 18h. The wavelength of the spectral line observed changes for a maximum of 563 nm to a minimum of 539 nm. Assume that the binary system consists of two identical stars. Determine the mass of each object.
By observing an alternating Doppler shift of a spectral line, the astronomers can deduce the existence of a binary star system, which otherwise cannot be resolved visually. Suppose that an astronomical observation shows that the source of light is eclipsed once every 18h. The wavelength of the spectral line observed changes for a maximum of 563 nm to a minimum of 539 nm. Assume that the binary system consists of two identical stars. Determine the mass of each object.
Physics-General
Physics-
A square ground of side 
has a circular running track of radius a/2 with its centre coinciding the centre of the ground. A man is running on the track with an angular velocity 
while a car is moving on a road adjacent to ground as shown in the figure. The car moves in such away that the car, the man and the centre of the ground always lie on the same straight line. If a source of sound of frequency v=300 Hz is being placed at the centre of the ground find the minimum frequency received by the man in the car. Assume velocity of sound in air is v=330 m/s.
A square ground of side has a circular running track of radius a/2 with its centre coinciding the centre of the ground. A man is running on the track with an angular velocity while a car is moving on a road adjacent to ground as shown in the figure. The car moves in such away that the car, the man and the centre of the ground always lie on the same straight line. If a source of sound of frequency v=300 Hz is being placed at the centre of the ground find the minimum frequency received by the man in the car. Assume velocity of sound in air is v=330 m/s.
Physics-General
Physics-
Two straight parallel railway tracks are separated by a distance of 20 m. Two trains start simultaneously with speeds 54 km/hr in opposite directions from A and B as shown. They have identical frequencies of their horns which is 660 Hz. Find the frequency of the horn heard by any of the train driver due to the other, 15 min after the start
Two straight parallel railway tracks are separated by a distance of 20 m. Two trains start simultaneously with speeds 54 km/hr in opposite directions from A and B as shown. They have identical frequencies of their horns which is 660 Hz. Find the frequency of the horn heard by any of the train driver due to the other, 15 min after the start
Physics-General
Physics-
At t=0, a source of sonic oscillations 
and an observer O start moving along x and y axes with velocity 5 m/s and 10 m/s respectively. The figure gives their position at t=0. The frequency of sonic oscillations of source is 1000 Hz. Obtain the frequency of signals received by the observer after 5 seconds. Speed of sound is 330 m/s.
At t=0, a source of sonic oscillations and an observer O start moving along x and y axes with velocity 5 m/s and 10 m/s respectively. The figure gives their position at t=0. The frequency of sonic oscillations of source is 1000 Hz. Obtain the frequency of signals received by the observer after 5 seconds. Speed of sound is 330 m/s.
Physics-General
Physics-
A source of sound emitting a frequency 660 Hz is moving counter-clockwise in a circular path of radius 2 metres with an angular velocity 15rad/s. A recorder at a distance from the source is moving simple harmonically along a straight line with an amplitude 2 metres. The frequency of SHM is 
per second. The arrangement is shown in figure. When the source is at point 
the detector is at D. Find the maximum and minimum frequencies recorded. Velocity of sound in air at this temperature can be taken as 300 m/s
A source of sound emitting a frequency 660 Hz is moving counter-clockwise in a circular path of radius 2 metres with an angular velocity 15rad/s. A recorder at a distance from the source is moving simple harmonically along a straight line with an amplitude 2 metres. The frequency of SHM is per second. The arrangement is shown in figure. When the source is at point the detector is at D. Find the maximum and minimum frequencies recorded. Velocity of sound in air at this temperature can be taken as 300 m/s
Physics-General
Physics-
An engine whistling at a constant frequency 
and moving with a constant velocity goes past a stationary observer. As the engine crosses him, the frequency of the sound heard by him changes by a factor f The actual difference in the frequencies of the sound heard by him before and after the engine crosses him is
An engine whistling at a constant frequency and moving with a constant velocity goes past a stationary observer. As the engine crosses him, the frequency of the sound heard by him changes by a factor f The actual difference in the frequencies of the sound heard by him before and after the engine crosses him is
Physics-General
Physics-
A detector is released from rest over a source of sound of frequency 
. The frequency observed by the detector at time 
is plotted in the graph. The speed of sound in air is 
A detector is released from rest over a source of sound of frequency . The frequency observed by the detector at time is plotted in the graph. The speed of sound in air is
Physics-General
Maths-
The length of the line segment intercepted between the axes by the line joining (6, -4) (-3, 8) is
The length of the line segment intercepted between the axes by the line joining (6, -4) (-3, 8) is
Maths-General
Maths-
If 
If
Maths-General
Maths-
Simplify 
Simplify
Maths-General
Maths-
If 
If
Maths-General
Maths-
The distance of the line 3x – y = 0 from the point (4, 1) measured along a line making an angle of 135º with the x – axis is
The distance of the line 3x – y = 0 from the point (4, 1) measured along a line making an angle of 135º with the x – axis is
Maths-General
Physics-
A stationary sound source 's' of frequency 334 Hz and a stationary observer ' O ' are placed near a reflecting surface moving away from the source with velocity 2 m/sec as shown in the figure. If the velocity of the sound waves is air is V=330 m/sec, the apparent frequency of the echo is
A stationary sound source 's' of frequency 334 Hz and a stationary observer ' O ' are placed near a reflecting surface moving away from the source with velocity 2 m/sec as shown in the figure. If the velocity of the sound waves is air is V=330 m/sec, the apparent frequency of the echo is
Physics-General
