## A bat is flitting about in a cave, navigating via ultrasonic beeps. Assume that the sound emission frequency of the bat is 40 kHz. During one fast swoop directly toward a flat wall surface, the bat is moving at 0.03 times the speed of sound in air. What frequency does the bat hear reflected off the wall?

A bat is flitting about in a cave, navigating via ultrasonic beeps. Assume that the sound emission frequency of the bat is 40 kHz. During one fast swoop directly toward a flat wall surface, the bat is moving at 0.03 times the Read More …

## Earthquakes generate sound waves inside the earth. Unlike a gas, the earth can experience both transverse (S) and longitudinal (P) sound waves. Typically the speed of S wave is about  4.0 km s-1 , and that of P wave is  8.0 km s-1 .A seismograph records P and S waves from an earthquake. The first P wave arrives 4 min before the first S wave. Assuming the waves travel in straight line, at what distance does the earthquake occur?

Earthquakes generate sound waves inside the earth. Unlike a gas, the earth can experience both transverse (S) and longitudinal (P) sound waves. Typically the speed of S wave is about  4.0 km s-1 , and that of P wave is  8.0 km Read More …

## A SONAR system fixed in a submarine operates at a frequency 40.0 kHz. An enemy submarine  moves towards the SONAR with a speed of  360 . kmh-1 What is the frequency of sound reflected by the submarine? Take the speed of sound in water to be  1450 m s-1 .

A SONAR system fixed in a submarine operates at a frequency 40.0 kHz. An enemy submarine  moves towards the SONAR with a speed of  360 . kmh-1 What is the frequency of sound reflected by the submarine? Take the speed of sound Read More …

## One end of a long string of linear mass density  8.0× 10-3 kgm-1 is connected to an electrically driven tuning fork of frequency 256 Hz. The other end passes over a pulley and is tied to a pan containing a mass of 90 kg. The pulley end absorbs all the incoming energy so that reflected wave s at this end have negligible amplitude. At t = 0, the left end (fork end) of the string x = 0 has zero transverse displacement (y = 0) and is moving along positive y-direction. The amplitude of the wave is 5.0 cm. Write down the transverse displacement y as function of x and t that describes the wave on the string.

One end of a long string of linear mass density  8.0× 10-3 kgm-1 is connected to an electrically driven tuning fork of frequency 256 Hz. The other end passes over a pulley and is tied to a pan containing a mass of 90 Read More …

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