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Easy
Question
Observe O is ahead by L from source S which are moving along same line with velocities V0 and VS respectively. The speed of sound is V. The source emits a wave pulse that reaches the obsever in time t1
At time t=T, the source reaches at | S . It is obvious that the observer will not be at O this time. The source emits a wavepulse at this time to reach the observer in time t2, which is measured from t=0
Find the time 
The correct answer is:
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A narrow tube is bent in the form of a circle of radius R, as shown in the figure. Two small holes S and D are made in the tube at the positions right angle to each other. A source placed at S generates a wave of intensity I0 which is equally divided into two parts: one part travels along the longer path, while the other travels along the shorter path. Both the part waves meet at the point D where a detector is placed
The maximum intensity produced at D is given by
A narrow tube is bent in the form of a circle of radius R, as shown in the figure. Two small holes S and D are made in the tube at the positions right angle to each other. A source placed at S generates a wave of intensity I0 which is equally divided into two parts: one part travels along the longer path, while the other travels along the shorter path. Both the part waves meet at the point D where a detector is placed
The maximum intensity produced at D is given by
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A narrow tube is bent in the form of a circle of radius R, as shown in the figure. Two small holes S and D are made in the tube at the positions right angle to each other. A source placed at S generates a wave of intensity I0 which is equally divided into two parts: one part travels along the longer path, while the other travels along the shorter path. Both the part waves meet at the point D where a detector is placed
If a minima is formed at the detector then, the magnitude of wavelength of the wave produced is given by
A narrow tube is bent in the form of a circle of radius R, as shown in the figure. Two small holes S and D are made in the tube at the positions right angle to each other. A source placed at S generates a wave of intensity I0 which is equally divided into two parts: one part travels along the longer path, while the other travels along the shorter path. Both the part waves meet at the point D where a detector is placed
If a minima is formed at the detector then, the magnitude of wavelength of the wave produced is given by
Physics-General
Physics-
A narrow tube is bent in the form of a circle of radius R, as shown in the figure. Two small holes S and D are made in the tube at the positions right angle to each other. A source placed at S generates a wave of intensity I0 which is equally divided into two parts: one part travels along the longer path, while the other travels along the shorter path. Both the part waves meet at the point D where a detector is placed
If a maxima is formed at a detector then, the magnitude of wavelength of the wave produced is given by
A narrow tube is bent in the form of a circle of radius R, as shown in the figure. Two small holes S and D are made in the tube at the positions right angle to each other. A source placed at S generates a wave of intensity I0 which is equally divided into two parts: one part travels along the longer path, while the other travels along the shorter path. Both the part waves meet at the point D where a detector is placed
If a maxima is formed at a detector then, the magnitude of wavelength of the wave produced is given by
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Superposition of waves results in maximum and minimum of intensities such as in case of standing waves. This phenomenon is called as interference. Another type of superposition result in interference in time which is called as beats. In this case waves are analyzed at a fixed point as a function of time. If the two waves are of nearby same frequency are superimposed, at a particular point, intensity of combined waves gives a periodic peak and fall. This phenomenon is beats. If w1 and w2 are the frequencies of two waves then by superimposed y = y1 + y2 , we get at x = 0, 
Thus amplitude frequency is small and fluctuates slowly. A beat i.e., a maximum of intensity occurs, also intensity depends on square of amplitude. The beat frequency is given by 
Number of beats per second is called as beat frequency. A normal ear can detect only upto 10 Hz of frequency because of persistence of ear The frequency of beats produced in air when two sources of sound are activated, one emitting wavelength 32 cm, other 32.2 cm is 
Superposition of waves results in maximum and minimum of intensities such as in case of standing waves. This phenomenon is called as interference. Another type of superposition result in interference in time which is called as beats. In this case waves are analyzed at a fixed point as a function of time. If the two waves are of nearby same frequency are superimposed, at a particular point, intensity of combined waves gives a periodic peak and fall. This phenomenon is beats. If w1 and w2 are the frequencies of two waves then by superimposed y = y1 + y2 , we get at x = 0, Thus amplitude frequency is small and fluctuates slowly. A beat i.e., a maximum of intensity occurs, also intensity depends on square of amplitude. The beat frequency is given by Number of beats per second is called as beat frequency. A normal ear can detect only upto 10 Hz of frequency because of persistence of ear The frequency of beats produced in air when two sources of sound are activated, one emitting wavelength 32 cm, other 32.2 cm is
Physics-General
Physics-
A traveling wave on stretched string can be understood by the function y = f(x -vt). Here v is the wave speed ‘x’ is co-ordinate of point and ‘y’ is its instantaneous displacement. To describe the wave completely, we must specify the function f. If the wave moves in negative x-direction y (x, t) = f(x + vt) and if it moves in positive x-direction y (x, t) = f(x - vt). The general relation for a traveling wave must satisfy the relation 
, if plane wave exists. The particle velocity and wave velocity are related by Vpa = - (slope) (wave velocity ). Answer the following questionsConsider the snapshot of a wave traveling in positive x-direction
A traveling wave on stretched string can be understood by the function y = f(x -vt). Here v is the wave speed ‘x’ is co-ordinate of point and ‘y’ is its instantaneous displacement. To describe the wave completely, we must specify the function f. If the wave moves in negative x-direction y (x, t) = f(x + vt) and if it moves in positive x-direction y (x, t) = f(x - vt). The general relation for a traveling wave must satisfy the relation , if plane wave exists. The particle velocity and wave velocity are related by Vpa = - (slope) (wave velocity ). Answer the following questionsConsider the snapshot of a wave traveling in positive x-direction
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Radio waves coming at angle a to vertical are received by a ladder after reflection from a nearby water surface and also directly. What can be height of antenna from water surface so that it records a maximum intensity (a maxima) (wavelength = l )
Radio waves coming at angle a to vertical are received by a ladder after reflection from a nearby water surface and also directly. What can be height of antenna from water surface so that it records a maximum intensity (a maxima) (wavelength = l )
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Two coherent narrow slits emitting wave length l in the same phase are placed parallel to each other at a small separation of 2 l , the sound is detected by moving a detector on the screen S at a distance D (>> l ) from the slit S1 as shown in figure.Find the distance x such that the intensity at P is equal to the intensity at O
Two coherent narrow slits emitting wave length l in the same phase are placed parallel to each other at a small separation of 2 l , the sound is detected by moving a detector on the screen S at a distance D (>> l ) from the slit S1 as shown in figure.Find the distance x such that the intensity at P is equal to the intensity at O
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Physics-
Sound from two coherent sources S1 and S2 are sent in phase and detected at point P equidistant from both the sources. Speed of sound in normal air is V0 , but in some part in path S1 , there is a zone of hot air having temperature 4 times, the normal temperature, and width d. What should be minimum frequency of sound, so that minima can be found at P?
Sound from two coherent sources S1 and S2 are sent in phase and detected at point P equidistant from both the sources. Speed of sound in normal air is V0 , but in some part in path S1 , there is a zone of hot air having temperature 4 times, the normal temperature, and width d. What should be minimum frequency of sound, so that minima can be found at P?
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Figure shows two snapshots of medium particles within a time interval of 1/60 s. Find the possible time periods of the wave
Figure shows two snapshots of medium particles within a time interval of 1/60 s. Find the possible time periods of the wave
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Two coherent sources S1 and S2 at a distance interference effect at point P,O is the middle point of S1S2 and origin of the coordinate system, as shown, such that 
Find the coordinate of source S1 when sources are rotated about point O so that no interference effect is observed at P:
Two coherent sources S1 and S2 at a distance interference effect at point P,O is the middle point of S1S2 and origin of the coordinate system, as shown, such that Find the coordinate of source S1 when sources are rotated about point O so that no interference effect is observed at P:
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A boy is moving along a circular track in anticlockwise sense. A children train moves along a square path with centres of circular track and square both coinciding, as shown in the figure. the train as well as the boy start from points B and A such that points O, A and B always lie on the same radial line. The velocity of listener is 11 m/s. The train continuously whistles at frequency 300 Hz. during one such complete rotation the maximum and minimum frequency heard by the boy. are respectively ( Take velocity of sound 330 m/s)
A boy is moving along a circular track in anticlockwise sense. A children train moves along a square path with centres of circular track and square both coinciding, as shown in the figure. the train as well as the boy start from points B and A such that points O, A and B always lie on the same radial line. The velocity of listener is 11 m/s. The train continuously whistles at frequency 300 Hz. during one such complete rotation the maximum and minimum frequency heard by the boy. are respectively ( Take velocity of sound 330 m/s)
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The figure shows the location of a source and detector at time t = 0. the source and detector are moving with velocities 
respectively. The frequency of signals received by the detector at the moment when the source crosses the origin is ( the frequency of source is 100 Hz.velocity of sound 330 ms -1)
The figure shows the location of a source and detector at time t = 0. the source and detector are moving with velocities respectively. The frequency of signals received by the detector at the moment when the source crosses the origin is ( the frequency of source is 100 Hz.velocity of sound 330 ms -1)
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A police car moving at 22 m/s chases a motorcyclist. The police man sound his horn at 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. If the motorcyclist does not observe any beats, the speed of motor cycle is 
A police car moving at 22 m/s chases a motorcyclist. The police man sound his horn at 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. If the motorcyclist does not observe any beats, the speed of motor cycle is
Physics-General
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A massless rod of length 
is hung from the ceiling with the help of two identical wires attached at its ends. A block is hung on the rod at a distance x from the left end. In this case, the frequency of the 1st harmonic of the wire on the left end is equal to the frequency of the 2nd harmonic of the wire on the right. The value of x is
A massless rod of length is hung from the ceiling with the help of two identical wires attached at its ends. A block is hung on the rod at a distance x from the left end. In this case, the frequency of the 1st harmonic of the wire on the left end is equal to the frequency of the 2nd harmonic of the wire on the right. The value of x is
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Physics-
An incandescent light bulb has a tungsten filament that is heated to a temperature 
when an electric current passes through it. If the surface area of the filament is approximately 
and it has an emissivity of 0.32, the power radiated by the bulb is
An incandescent light bulb has a tungsten filament that is heated to a temperature when an electric current passes through it. If the surface area of the filament is approximately and it has an emissivity of 0.32, the power radiated by the bulb is
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