9. A jet flies toward higher altitude at a constant speed of 1 963 m/s in a direction that makes an angle 0 with the horizontal (Fig.). An observer on the ground hears the jet for the first time when it is directly overhead. Determine the value of 0 if the speed of sound in air is 340 m/s.

4. An observer is standing on the platform of a railway station. A train goes through the station without stopping. If the frequency of the train whistle decreases by a factor of 1/4 as it approaches and then passes him, calculate the speed of the train (assume the speed of sound in air = 343 m/s).

102 kg/m3? What is the speed of sound in benzene, which has a bulk modulus of 1.05 x 109 Pa and a density of 8.76 x 1094.82 km/s

1. A stone of mass M = 1.3 kg is suspended from a string on a 30-degree incline as shown above. If the length of the string is 75 cm and the mass of the string is 4 g, how long would it take a transverse wave to travel from one end of the string to the other?

Ocean waves with a wavelength of 40.0 m travel at 5.00 m/s towards a boat at sea. Determine the number of times the boat bobs up and down per minute as a result of encountering the waves.

10. An organ pipe is 118 cm long. What is the third audible harmonic if the pipe is open at both ends? The speed of sound in air is 345 m/s. Hz

7. On a given day, the speed of sound in air is 3434m/s. As an emergency vehicle approaches you, youhear a tone that is 1200Hz. That type of emergency vehicle has a siren that emits a tone that is 1050Hz.(a) What is the speed of the vehicle? (b) As it drives away from you, what tone do you hear?

Sound intensity D (decibels) is measured relative to the lowest human–detectable sound I0 = 10–12 W m–2. D = 10 log (I/I0)  What is the relative intensity from a jet with I = 9.5 × 102 W m–2 ?   D = 95   D = 150   D = 15

30 m from an ultrasonic sensor. The total travel time of the ultrasonic wave is 33 ms (milliseconds). What is the speed of sound in these conditions?

1.  A sound wave propagating in air has a frequency of 220 Hz. What is its wavelength? (The speed of sound in air is 343 m/s.) 0.641 m 4.55 mm 220 m 343 m 1.56 m