1. In still air, with a speed of sound, v = 343.0 m / s, a source of sound A is moving directly toward a reflecting surface B. Reflecting surface B is moving directly away from source A. The speed of A is v, =162 km / h and the speed of B is V = 86.4 km /h. Sound source A emits waves of А frequency f, =1200.0 Hz in the frame of A. а. What is the frequency heard by a detector mounted on and moving with reflecting surface B, Bd What is the frequency of the reflected wave as heard by a detector mounted on and moving with sound source A, f4? b.

An osprey (a type of hawk) has a distinct call: a whistle at 2100 Hz. An osprey calls while diving at you — you’ve gotten too close to her nest and she wants to drive you away! The frequency you perceive is 2400 Hz. How fast is the osprey approaching? (The speed of sound in air varies with temperature, but in this problem you can take it to be 343 m/s, the speed at 20◦C.)

You are hiking along a trail in a wide, dry canyon where the outdoor temperature is T = 25.5° C. To determine how far you are away from the canyon wall you yell “Hello” and hear the echo t = 1.95 s later. T = 25.5° Ct = 1.95 s A. Calculate the speed of sound in the valley in meters per second, assuming the speed at 0° C is 332 m/s.  B. How far are you from the canyon wall, in meters?  C. If you stood at the same point on a cold morning where the temperature was T2 = 3.5 degrees C, how long would it have taken for you to hear the echo, in seconds?

A violin string is 25cm long.  It sounds the musical note A (440Hz) when played without fingering.  It is known that the mass of the string is 3.50x10^-4 kg.   a. What is the tension in the string in Newtons?

a. A bat emits short pulses of sound at a frequency of 160000 Hz. Assume the velocity of sound in air is 340 m/s As the bat swoops toward a flat wall at speed 11 m/s, this sound is reflected from the wall back to the bat. What is the frequency of sound incident on the wall? b.Consider the wall as a sound source at the frequency calculated previously. What frequency of sound does the bat hear coming from the wall?

On a warm summer day (33 ∘C), it takes 4.90 s for an echo to return from a cliff across a lake. On a winter day, it takes 5.30 s . The speed of sound in air is v≈(331+0.60T)m/s, where T is the temperature in ∘C. What is the temperature on the winter day?

An airplane is flying at speed 200 m/s with respect to the ground. Sound wave 1 is approaching the plane from the front, while sound wave 2 is catching up from behind. Both waves travel at 340 m/s relative to the ground. What is the velocity of each wave relative to the plane?

and 4.00 m from the other? Ans. 4.1 rad 7. A bat flies toward a wall at a speed of 5.0 m/s. As it flies, the bat emits an ultrasonic sound wave with frequency 30 kHz. What frequency does the bat hear in the reflected wave? 8 The solution of travelling wave v(cos(kx - wt) is Ans. 30,888 kHz w²0²y a²y

You are on a boat in a fog and know there are cliffs ahead of you somewhere, but you cannot see them. You use your fog horn to send out a blast of sound (assume the temperature of the air is 20 oC) and the time it takes for the sound to return to you is 20.0 s. How far away are the cliffs (in metric units)? Hint: Be careful and think about the physics of the problem. You may want to make a sketch of the situation to help you determine the answer.     1798 m   3444 m   3596 m   7192 m

S X * # 3 4. A bystander hears a siren vary in frequency from 594 Hz to 388 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.) X 62.7 m/s E D C 25 $ 4 888 R % 5 V tv A B 16 de MacBook Air & 7 H VO 8 UTO N A J 9 M K MOSISO O zoom 1 ge + 11 t