JEE Mains Physics 2002-2019 Solved Video Solutions
A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is f1 . If the speed of the train is reduced to 17 m/s, the frequency registered is f2 . If speed of sound is 340 m/s, then the ratio f1/f2 is
07
Nov
A train moves towards a stationary observer with speed 34 m/s. The train sounds a whistle and its frequency registered by the observer is f1 . If the speed of the train is reduced to 17 m/s, the frequency registered is f2 . If speed of sound is 340 m/s, then the ratio f1/f2 is [...]
A musician using and open flute of length 50 cm produces second harmonic sound waves. A person runs towards the musician from another end of a hall at a speed of 10 km/h from the second end of room. If the wave speed is 330 m/s, the frequency heard by the running person will be
07
Nov
A musician using and open flute of length 50 cm produces second harmonic sound waves. A person runs towards the musician from another end of a hall at a speed of 10 km/h from the second end of room. If the wave speed is 330 m/s, the frequency heard by the running person will be [...]
A small speaker delivers 2 W of audio output. At what distance from the speaker will one detect 120 dB intensity sound ? [Given reference intensity of sound as 10^−12W/m^2
07
Nov
A small speaker delivers 2 W of audio output. At what distance from the speaker will one detect 120 dB intensity sound ? [Given reference intensity of sound as 10^−12W/m^2 A small speaker delivers 2 W of audio output. At what distance from the speaker will one detect 120 dB intensity sound ? [Given reference [...]
A tuning fork of frequency 480Hz is used in an experiment for measuring speed of sound (v) in air by resonance tube method. resonance is observed to occur at two successive lengths of the air column, l1 = 30cm and l2 = 70cm. Then v is equal to:
07
Nov
A tuning fork of frequency 480Hz is used in an experiment for measuring speed of sound (v) in air by resonance tube method. resonance is observed to occur at two successive lengths of the air column, l1 = 30cm and l2 = 70cm. Then v is equal to: A tuning fork of frequency 480Hz is [...]
Two sources of sound S1 and S2 produce sound waves of same frequency 660 Hz. A listener is moving from source S1 towards S2 with a constant speed um/s and he hears 10 beats/s. The velocity of sound is 330 m/s. Then, u equals:
07
Nov
Two sources of sound S1 and S2 produce sound waves of same frequency 660 Hz. A listener is moving from source S1 towards S2 with a constant speed um/s and he hears 10 beats/s. The velocity of sound is 330 m/s. Then, u equals: A string 2.0m long and fixed at its ends is driven [...]
A progressive wave travelling along the positive x-direction is represented by y(x,t)=Asin(kx−ωt+ϕ). Its snapshot at t=0 is given in the figure. For this wave, the phase is:
07
Nov
A progressive wave travelling along the positive x-direction is represented by y(x,t)=Asin(kx−ωt+ϕ). Its snapshot at t=0 is given in the figure. For this wave, the phase is: A progressive wave travelling along the positive x-direction is represented by y(x t)=Asin(kx−ωt+ϕ). Its snapshot at t=0 is given in the figure. For this wave the phase is: [...]
A submarine (A) travelling at 18 km/hr is being chased along the line of its velocity by another submarine (B) travelling at 27 km/hr. B sends a sonar signal of 500Hz to detect A and receives a reflected sound of frequency v. The value of v is close to : (Speed of sound in water = 1500ms^−1 )
07
Nov
A submarine (A) travelling at 18 km/hr is being chased along the line of its velocity by another submarine (B) travelling at 27 km/hr. B sends a sonar signal of 500Hz to detect A and receives a reflected sound of frequency v. The value of v is close to : (Speed of sound in water [...]
A source of sound S is moving with a velocity of 50m/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 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 the sound in the medium is 350 m/s
07
Nov
A source of sound S is moving with a velocity of 50m/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 as 1000 Hz. What will be the apparent frequency of the source when it is moving away from the [...]
The correct figure that shows, schematically, the wave pattern produced by superposition of two waves of frequencies 9Hz and 11Hz is :
07
Nov
The correct figure that shows, schematically, the wave pattern produced by superposition of two waves of frequencies 9Hz and 11Hz is : schematically The correct figure that shows the wave pattern produced by superposition of two waves of frequencies 9Hz and 11Hz is : November 7, 2020 Category: Chapter 10 - Oscillation and Waves , [...]
A stationary source of sound is emitting sound of frequency 500Hz. Two observers A and B lying on the same line as the source, observe frequencies 480Hz and 530Hz respectively. The velocity of A and B respectively are (in m/s), speed of sound =300 m/s.
07
Nov
A stationary source of sound is emitting sound of frequency 500Hz. Two observers A and B lying on the same line as the source, observe frequencies 480Hz and 530Hz respectively. The velocity of A and B respectively are (in m/s), speed of sound =300 m/s. A stationary source of sound is emitting sound of frequency [...]