Chapter 17 – Sound Waves
The frequency of a radar is 780 MHz. After getting reflected from an approaching aeroplane, the apparent frequency is more than the actual frequency by 2.6 kHz. The aeroplane has a speed of
31
Oct
The frequency of a radar is 780 MHz. After getting reflected from an approaching aeroplane, the apparent frequency is more than the actual frequency by 2.6 kHz. The aeroplane has a speed of the apparent frequency is more than the actual frequency by 2.6 kHz. The aeroplane has a speed of The frequency of a [...]
The apparent wavelength of the light from a star, moving away from the earth is 0.01% more than its real wavelength. The speed of the star with respect to earth is
31
Oct
The apparent wavelength of the light from a star, moving away from the earth is 0.01% more than its real wavelength. The speed of the star with respect to earth is moving away from the earth is 0.01% more than its real wavelength. The speed of the star with respect to earth is The apparent [...]
A sound wave of frequency f travels horizontally to the right. It is reflected from a large vertical plane surface moving to left with a speed v. The speed of sound in medium is C, then
31
Oct
A sound wave of frequency f travels horizontally to the right. It is reflected from a large vertical plane surface moving to left with a speed v. The speed of sound in medium is C, then A sound wave of frequency f travels horizontally to the right. It is reflected from a large vertical plane [...]
A band playing music at a frequency f is moving towards a wall at a speed vb. A motorist is following the band with a speed vm. If v is the speed of sound, obtain an expression for the beat frequency heard by the motorist is
31
Oct
A band playing music at a frequency f is moving towards a wall at a speed vb. A motorist is following the band with a speed vm. If v is the speed of sound, obtain an expression for the beat frequency heard by the motorist is A band playing music at a frequency f is [...]
Two cars are moving on two perpendicular roads towards a crossing with uniform speeds of 72kmh and 36kmh. If second car blows horn of frequency 280 Hz, then the frequency of horn heard by the driver of first car when the line joining the cars makes angle of 45^∘C with the roads, will be (velocity of sound is 330 m/s)
31
Oct
Two cars are moving on two perpendicular roads towards a crossing with uniform speeds of 72kmh and 36kmh. If second car blows horn of frequency 280 Hz, then the frequency of horn heard by the driver of first car when the line joining the cars makes angle of 45^∘C with the roads, will be (velocity [...]
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then the frequency of horn heard by the driver of first car when the line joining the cars makes angle of 45^∘C with the roads ,
Two cars are moving on two perpendicular roads towards a crossing with uniform speeds of 72kmh and 36kmh. If second car blows horn of frequency 280 Hz ,
will be (velocity of sound is 330 m/s) ,
A racing car moving towards a cliff, sounds its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If v is the velocity of sound, then the velocity of the car is
31
Oct
A racing car moving towards a cliff, sounds its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If v is the velocity of sound, then the velocity of the car is A racing car moving towards a cliff sounds [...]
A siren placed at a railway platform is emitting sound of frequency 5kHz. A passenger sitting in a moving train A records a frequency of 5.5kHz while the train approaches the siren. During his return journey in a different train B he records a frequency of 6.0kHz while approaching the same siren. the ratio the velocity of train B to that of train A is
31
Oct
A siren placed at a railway platform is emitting sound of frequency 5kHz. A passenger sitting in a moving train A records a frequency of 5.5kHz while the train approaches the siren. During his return journey in a different train B he records a frequency of 6.0kHz while approaching the same siren. the ratio the [...]
A train moves towards a stationary observer with speed 34m/s. The train sounds a whistle and its frequency registered by the observer is f1. If the train’s speed is reduced to 17m/s, the frequency registered is f2. If the speed of sound of 340m/s, then the ratio f1/f2is
31
Oct
A train moves towards a stationary observer with speed 34m/s. The train sounds a whistle and its frequency registered by the observer is f1. If the train’s speed is reduced to 17m/s, the frequency registered is f2. If the speed of sound of 340m/s, then the ratio f1/f2is A train moves towards a stationary observer [...]
A police car moving at 22m/s, chases motorcyclist. The police man sounds his horn at 176Hz, while both of them move towards a stationary siren of frequency 165Hz. Calculate the speed of the motorcycle, if it is given that he does not observes any beats.
31
Oct
A police car moving at 22m/s, chases motorcyclist. The police man sounds his horn at 176Hz, while both of them move towards a stationary siren of frequency 165Hz. Calculate the speed of the motorcycle, if it is given that he does not observes any beats. A police car moving at 22m/s chases motorcyclist. The police [...]
A car is moving with a velocity of 5m/s towards huge wall. The driver sounds a horn of frequency 165Hz. If the speed of sound in air is 335m/s, the number of beats heard per second by the driver is
31
Oct
A car is moving with a velocity of 5m/s towards huge wall. The driver sounds a horn of frequency 165Hz. If the speed of sound in air is 335m/s, the number of beats heard per second by the driver is A car is moving with a velocity of 5m/s towards huge wall. The driver sounds [...]