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 km/h. What is the frequency of sound reflected by the enemy submarine? (the speed of sound in water to be 1450 m/sec.)

(1) 44.2 kHz

(2) 45.9 kHz

(3) 43.7 kHz

(4) 46.1 kHz

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 the S wave is about 4.0 km/s, and that of the P waves is 8.0 km/s. 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 a straight line, at what distance does the earthquake occur?

1. 1854 km
2. 2320 km
3. 1920 km
4. 2000 km

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 moves at 0.03 times the speed of sound in the air. What frequency does the bat hear reflected off the wall?

1. 41.27 kHz

2. 42.67 kHz

3. 41.23 kHz

4. 42.47 kHz

Which of the following phenomenon cannot take place with sound waves?

(1) Polarisation

(2) Refraction

(3) Diffraction

(4) Reflection

The speed of sound in air is independent of its:

(1) Amplitude

(2) Frequency

(3) Phase

(4) All of these

The waves which cannot travel without medium are:

(1) X-rays

(2) Radio waves

(3) Light waves

(4) Sound waves

When a wave propagating through a medium encounters a change in medium, then which of the following property remains the same?

(1) Speed

(2) Amplitude

(3) Frequency

(4) Wavelength

A transverse wave travels along the x-axis. The particles of medium move:

(1) Along the x-axis

(2) Along the y-axis

(3) Along the z-axis

(4) Either along the y-axis or z-axis

The phenomenon of sound propagation in the air is:

(1) An isothermal process

(2) An adiabatic process

(3) An isobaric process

(4) An isochoric process

If at STP, the velocity of sound in a gas $(\gamma =1.5)$ is 600 m/s, the RMS velocity of the gas molecules at STP will be:

(1) 400 m/s

(2) 600 m/s

(3) 600$\sqrt{2}$ m/s

(4) 300$\sqrt{2}$ m/s