With what speed must you approach a source of sound to observe a 15% change in frequency?
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With what speed must you approach a source of sound to observe a 15% change in frequency?
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- The siren of a policy car at rest emits a frequency of 1600 Hz. What frequency do you detect if you move with a speed of 40 m/s toward the policy car? Assume: The Speed of the sound is 344 m/s.The coldest and hottest temperature ever recorded in the United States are -83 degrees Fahrenheit (210 K) and 134 degrees Fahrenheit (330 K), respectively. What is the speed of sound in air at each temperature?How far way is a storm if you hear the sound of thunder 7.0 s after the lightening flash on a day when the air temperature is 31°C?
- A bat flying in a cave emits a sound and receives its echo 0.09 s later. Find the distance to the wall of the cave. Express your answer to two significant figures and include the appropriate units.Wei is standing on a platform when an approaching XPT train sounds its horn. The frequency of the horn is 500Hz and the train is travelling at 126km h- 1. What is the frequency of the horn as heard by Wei? (Assume the speed of sound in air is 340ms- 1.)A certain sound source is increased in sound level by 30.0 dB. By what multiple is (a) its intensity increased and (b) its pressure amplitude increased?
- A source of sound emits 5.0 mW of acoustic power uniformly in all directions.Calculate the intensity of this sound wave 10.0 m from the source. The answer will be X.XX 10-6 W/m2(a) What frequency is received by a person watching an oncoming ambulance moving at 120 km/h and emitting a steady 853 Hz sound from its siren? The speed of sound on this day is 345 m/s. Hz (b) What frequency does she receive after the ambulance has passed? HzOcean 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.
- If you dribble a basketball with a frequency of 1.80 HzHz, how much time does it take for you to complete 12 dribbles?A water wave has a frequency of 9.0 Hz and a wavelenght of 5.0m. (a) What is the period (in seconds) of these waves? (b) What is the wave velocity in m/s?How far does light travel in one year? [This distance is known as a light-year (ly) and is used in measuring astronomical distances.] Compute the wavelength in air of ultrasound with a frequency of 51 kHz if the speed of sound is 344 m/s.