Current Attempt in Progress Incorrect. A sound wave is incident on a pool of fresh water (20°C). The sound enters the water perpendicularly and travels a distance of 0.448 m before striking a 0.174-m-thick copper block lying on the bottom. The sound passes through the block, reflects from the bottom surface of the block, and returns to the top of the water along the same path. How much time elapses between when the sound enters and leaves the water? (Hint: Take the speed of sound to be 1482 m/s in water and 5010 m/s in copper.) Incident sound Reflected sound dwater dcopper

Two progressive waves yj = A sin( 4 x - ot) and y2 = A sin( 2" x – ot – 5) travel in the same direction. Calculate the velocity of the wave produced as a result of interference of these two waves. Take A = 5 cm, 1 =8.7 m and w =12.7 rad/s (radian per second). Give your answer in Sl units.

18. A sound wave s(r, t) = sm Cos(ka – wt +o) travels at 343 m/s through air in a long horizontal tube. At one instant, air molecule A at r = 2.00 m is at its maximum positive displacement of 6.0 nm and air molecule B at r = a positive displacement of 1.5 nm. All the molecules between A and B arc at intermediate displacements. What is the 2.05 m is at frequency of the wave? (1) 1400 Hz (2) 1300 Hz (3) 1200 Hz (4) 1100 Hz (5) 1000 Hz

The figure below shows wave fronts of sound waves from the siren of a police car. Two people on both side of the car are running at 5 m/s to the left. The frequency of the siren is 400 Hz. The person on the left observes a frequency of 388.7 Hz. Speed of sound in air is 340 m/s. a) How fast is the policy car travelling? b) What is the frequency observed by the person on the right? c) What is the wavelength observed by the person on the righ? R

In the figure, a French submarine and a U.S. submarine move toward each other during maneuvers in motionless water in the North Atlantic. The French sub moves at speed VF = 53.00 km/h, and the U.S. sub at vus = 68.00 km/h. The French sub sends out a sonar signal (sound wave in water) at 1.000 × 103 Hz. Sonar waves travel at 5470 km/h. (a) What is the signal's frequency as detected by the U.S. sub? (b) What frequency is detected by the French sub in the signal reflected back to it by the U.S. sub? (a) Number i French Unite VF LITHDI11111111 UT U.S.

In an experiment, students were testing their hearing range and found that it averaged about24.5 Hz to 1.82 x 104 Hz. What are the wavelengths of sound waves producing these frequencies in air where the speed of sound is 343 m/s?