Question

9. The speed of sound was measured in a block of using a sound source and a detector, as shown, The source travels through the block and was detected at the opposite end. From this information, the time interval for the wave to travel the entire length of the block was measured and metal (mass density of 2.700x10 kg/m produced a sound wave that determined to be 8.14x10s seconds. i. Calculate the speed of the sound wave through the metal block. Sound detector Sound source ii. Determine the adiabatic bulk modulus, Bef, for the metal block. Metal Block ili. What frequency of sound wave traveling through the metal would produce a wavelength equal to the length of this block? 10. Joey is snowboarding down a ski run at Mt. Hood Meadows, traveling at 30 m/s. As he heads toward the bottom of the run he sees a screaming, irate skier standing stationary at the bottom of the hill making obscene gestures at him. NOTE: At this temperature, the speed of sound (Vsound) in the air is 335.5 m/s. i) The skier bellows a naughty word at Joey, at a frequency of 250.0 Hz. Determine the frequency of the sound as observed by Joey li) After Joey passes by the skier, Joey then screams back at the skier. The source frequency of his scream is 450.0 Hz. As he travels away from the skier, what is the frequency of Joey's scream (as heard by the skier)?

Answer 1

dp So 13

10 33S S Io 333.$ 33 S +30
Doppler effect is used to know the relative frequencies of the source when observed by the observer for their relative motion.