2. In an increasingly rare scenario, an orca (killer whale) chases a salmon. The orca can locate the salmon by producing an echolocation "click" of 50.00 kHz frequency near its blowhole and directing it at the salmon. The "click" echoes off of the fleeing salmon, and returns to the orca, whose brain processes the change in frequency of the “click” into the speed of the salmon (the orca can also figure out how far away and in what direction the salmon is). In other words, the frequency changes twice. Assuming that the speed of sound in seawater is 1440. m/s, and that the water has no current, is the frequency of the returning “click” higher, lower or the same as the original 50.00 kHz? Use the Doppler formula and explain the signs of the various velocities involved. Remember, you'll have to use the formula twice – once on the way out, once on the way back. Hint: Assume the salmon and the orca are moving in the same direction. Is the salmon moving faster than the orca, or vice versa? Does that even matter? You should check both cases: the salmon faster and the orca faster. If the sound doesn't change frequency, note that this tool is useless to the orca.

In echolocation, a RADAR used infrared to determine the distance of a far away object. Estimate this range if the sender has received the reflected signal after 5.0 µs. 1.5 km 15 km 60 km 6.0 km

The electrical power needed to operate a speaker in your audio system is 18.7 W. If this speaker has a circular opening with a radius of 0.0743 m and the average sound intensity at the opening is 22.1 W/m2, determine the ratio of sound output power Psound to electrical input power Pelectrical. Psound Pelectrical

Two train whistles have identical frequencies of 1.58  102 Hz. When one train is at rest in the station and the other is moving nearby, a commuter standing on the station platform hears beats with a frequency of 4.00 beats/s when the whistles operate together. What are the two possible speeds that the moving train can have? moving away from the station      ?m/s moving towards the station      ?m/s

Dolphins of the open ocean are classified as Type II Odontocetes (toothed whales). These animals use ultrasonic "clicks" with a frequency of about 55 kHz to navigate and find prey.  Suppose a dolphin sends out a series of clicks that are reflected back from the bottom of the ocean 90 m below. How much time elapses before the dolphin hears the echoes of the clicks? (The speed of sound in seawater is approximately 1530 m/s.) What is the wavelength of 55 kHz sound in the ocean?

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Question 25 Read the passage about echolocation. Echolocation is used by some animals, such as whales and bats, to find the location of objects by sending out sound waves through a medium. The length of time it takes for the sound wave to strike an object and bounce back tells the location of the object. How would the length of time it takes a sound wave to return to a whale differ from the time it takes a sound wave to return to a bat? А A sound wave would return faster to a bat because sound travels faster in air than it does in water. A sound wave would return faster to a bat because the wavelength is shorter in air than in water. A sound wave would return faster to a whale because sound travels faster in water than it does in air. A sound wave would return faster to a whale because the wavelength is longer in water than in air. ©2021 Illuminate Education TM, Inc. hp B.

Police radars determine speed by measuring the Doppler shift of radio waves reflected by a moving vehicle. They do so by determining the beat frequency between the reflected wave and the 10.5 GHz emitted wave. Some units can be calibrated by using a tuning fork; holding a vibrating fork in front of the unit causes the display to register a speed corresponding to the vibration frequency. A tuning fork is labeled "60 mph."  What is the frequency of the tuning fork?