A physicist at a fireworks display times the lag between seeing an explosion and hearing its sound. She finds it to be 0.345 s. A. How far away is the explosion, in meters, if the air temperature is 28.5°C and if you neglect the time taken for light to reach the physicist? B. Calculate the distance, in meters, to the explosion taking the speed of light into account. (Note that this distance is negligibly greater than what you found in part (a).)

A police officer's radar gun emits radio waves at a frequency of 11.7 GHz. What is the difference in the frequencies reflected back to the radar gun by a car traveling at the 55 mph speed limit and a car travelling 6 mph faster? Assume that the cars are both headed directly away from the stationary officer. difference between frequencies: Hz

When poked by a spear, an operatic soprano lets out a 1047 Hz shriek. What is its wavelength (in m) if the speed of sound is 345 m/s? m Additional Materials O Reading

the car driver? *22.33. A 500-Hz train whistle is heard by a stationary observer at a frequency of 475 Hz. What is the speed of the train? Is it moving toward the observer or away from the observer? Ans. 18.1 m/s, away

(a) Neil A. Armstrong was the first person to walk on the moon. The distance between the earth and the moon is 3.85 × 108 m. Find the time it took for his voice to reach the earth via radio waves.  (b) Someday a person will walk on Mars, which is 5.60 × 1010 m from the earth at the point of closest approach. Determine the minimum time that will be required for a message from Mars to reach the earth via radio waves.

A bat flying in a cave emits a sound and receives its echo 0.14 ss later. Find the distance to the wall of the cave.

An observer at sea level does not hear an aircraft flying at 6000-m standard altitude until 15 s after it has passed over head. Estimate the aircraft speed in m/s.

An emergency vehicle with its siren turned on at a frequency of 790HZ, moves away from a stat ionary observer at a speed 25m/s. What frequency does the observer hear? 698 Hz O 757 Hz 735 Hz 750 Hz

1. In still air, with a speed of sound, v= 343.0m/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 VR = 86.4 km / h. Sound source A emits waves of 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 b. What is the frequency of the reflected wave as heard by a detector mounted on and moving with sound source A, JAd ?

A spacecraft transmits a microwave signal with a wavelength of 1.25 cm.  If the wavelength of the signal received on Earth is 1.255 cm, how fast is the spacecraft moving away from Earth?