Question Answers
Sahay Sir > Question Answers
An observer moves towards a stationary source of sound with a speed (1/5)th of the speed of sound. The wavelength and frequency of the source emitted are lemda and f, respectively.
07
Nov
An observer moves towards a stationary source of sound with a speed (1/5)th of the speed of sound. The wavelength and frequency of the source emitted are lemda and f, respectively. An observer moves towards a stationary source of sound with a speed (1/5)th of the speed of sound. The wavelength and frequency of the [...]
Speed of sound wave is v. If a reflector moves towards a stationary source emitting waves of frequency f with speed u, the frequency of reflected waves will be
07
Nov
Speed of sound wave is v. If a reflector moves towards a stationary source emitting waves of frequency f with speed u, the frequency of reflected waves will be Speed of sound wave is v. If a reflector moves towards a stationary source emitting waves of frequency f with speed u the frequency of reflected [...]
The frequency changes by 10% as the source approaches a stationary observer with constant speed vs. What should be the percentage change in frequency as the source recedes
07
Nov
The frequency changes by 10% as the source approaches a stationary observer with constant speed vs. What should be the percentage change in frequency as the source recedes The frequency changes by 10% as the source approaches a stationary observer with constant speed vs. What should be the percentage change in frequency as the source [...]
A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per second when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was
07
Nov
A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per second when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was it is reduced to l/8. [...]
Two sound sources are moving in opposite directions with velocities v1 and v2 (v1 > v2). Both are moving away from a stationary observer. The frequency of both the sources is
07
Nov
Two sound sources are moving in opposite directions with velocities v1 and v2 (v1 > v2). Both are moving away from a stationary observer. The frequency of both the sources is Two sound sources are moving in opposite directions with velocities v1 and v2 (v1 > v2). Both are moving away from a stationary observer. [...]
In the given figure the Area of each plate is A. The conducting plates are connected to a battery of emf V volts. Find charges q1 to q6.
07
Nov
In the given figure the Area of each plate is A. The conducting plates are connected to a battery of emf V volts. Find charges q1 to q6. In the given figure the Area of each plate is A. The conducting plates are connected to a battery of emf V volts. Find charges q1 to [...]
A metal wire of linear mass density of 9.8g/m is stretched with a tension of 10kg−wt between two rigid supports 1m apart. The wire passes at its middle point between the poles of a permanent magnet and it vibrates in resonance when carrying an alternating current of frequency n. The frequency n of the alternating source is
07
Nov
A metal wire of linear mass density of 9.8g/m is stretched with a tension of 10kg−wt between two rigid supports 1m apart. The wire passes at its middle point between the poles of a permanent magnet and it vibrates in resonance when carrying an alternating current of frequency n. The frequency n of the alternating [...]
Two dielectric slabs of relative oremittivities εr1=2 and εr2=3 and thickness s=2d are filled in between the grounde plattery each of area A If a battery of emf ε is connected to the middle conducting plate, dind the a. capacitance of the system, b. charge flowing through the battery, c. energy stored in the system.
07
Nov
Two dielectric slabs of relative oremittivities εr1=2 and εr2=3 and thickness s=2d are filled in between the grounde plattery each of area A If a battery of emf ε is connected to the middle conducting plate, dind the a. capacitance of the system, b. charge flowing through the battery, c. energy stored in the system. [...]
The displacement y of a wave travelling in the x-direction is given by y=10^−4 sin(600t − 2x + 3/π) metres. Where x is expressed in metre and t in second. The speed of the wave motion in m/s is
07
Nov
The displacement y of a wave travelling in the x-direction is given by y=10^−4 sin(600t − 2x + 3/π) metres. Where x is expressed in metre and t in second. The speed of the wave motion in m/s is The displacement y of a wave travelling in the x-direction is given by y=10^−4 sin(600t − [...]
One train is approaching an observer at rest and another train is receding from him with the same velocity 4 m/s. Both the trains blow whistles of same frequency of 243 Hz.
07
Nov
One train is approaching an observer at rest and another train is receding from him with the same velocity 4 m/s. Both the trains blow whistles of same frequency of 243 Hz. One train is approaching an observer at rest and another train is receding from him with the same velocity 4 m/s. Both the [...]