When a child presses a button on a toy car, the car produces a long "beep" sound with a frequency of 500 Hz. a. Calculate the period, T, of the beep. Show your calculations and include units in your answer. The sound of the beep travels through air at 340 m/s. b. Calculate the wavelength of the beep. Show your calculations and include units in your answer. The child presses the button and pushes the toy car away. The car moves 5 m before it stops. It continues to beep, even after it stops moving. c. Describe what happens to the amplitude of the beep observed by the child as the car move away from the child. d. When does the child hear a beep with a frequency lower than 500 Hz? Explain your answer.

An ambulance with its siren on is heading east along a straight highway at 65 mph. A car also moves on the same road. In which case will the driver of the car perceive that the frequency of the siren is lower? Select one: a. The car is moving west at 65 mph and is behind the ambulance. b. The car is moving west at 65 mph and is in front of the ambulance. c. The car is moving east at 65 mph and is in front of the ambulance. d. The car is moving east at 65 mph and is behind the ambulance.

t is a typical 0 celsius winter day. A. state the speed of sound. B. state the frequency range between infrasound and ultrasound for a typical person on this day. C. Determine the wave length of the longest and shortest  wavelength a human ear can detect on this winter day.

2 WA2: The same wave is represented in the snapshot and history graphs. A. Determine the wavelength and amplitude of the wave. B. Determine the period and frequency of the wave. C. What is the wave's speed? y (m) OUTCOME WA2 I can describe and analyze the properties of traveling waves y (m) 1.0 2.0 3.0 4.0 5.0 0.5 1.0 ^^^ 1.5 x (m) T 2.0 t (s)

At the pool, your friend’s watch beeps under the water. You hear a frequency of 1000 Hz from your spot on a beach chair. a. What is the wavelength of this sound in air? b. What is the frequency and wavelength of this sound wave under the water?

A bat flying at 5.25 m/s is chasing an insect flying at 3.49 m/s in the same direction. The bat emits a steady chirp of frequency 2000 Hz. a. What frequency, f0, does the insect hear? b. The insect becomes a moving source at frequency f0. What frequency does the bat hear reflected from the insect? c. The bat hears its own sound, plus the sound reflected by the insect. What beat frequency does the bat hear?