Phys 141 Sound and Acoustics HOMEWORK ASSIGNMENT #1 (Due 4:30 prn, Monday, Janua

Question

Phys 141 Sound and Acoustics HOMEWORK ASSIGNMENT #1 (Due 4:30 prn, Monday, January 29, 2018) Note: the speed of sound in air at room temperature (20°C) is 340 m's, Use equations in either the lecture notes or the midterm answer sheet format. 1) 3 points You hear a thunder 4 seconds after you see the lightning. Estimate how far from you the thunder occurred. (hint: it takes 4 seconds for the sound to travel from the source to you 2) 5 points Sound in air is: 2. 3. 4. 5. (choose faster or slower) (faster or slower) than a sport car (faster or slower) than a small propeller airplane (faster or slower) than a commercial jetliner (faster or slower) than a jetfighter (faster or slower) than light 3) 4 points The frequency limits of human hearing are about 20 Hz to 20000 kHz. (a) Calculate the periods of these oscillations for 20000 Hz (b) Calculate the wavelengths of these sound waves in air with frequency of 20000 Hz 4) 2 point What is the frequency of sound with a wavelength of O.1m? 5) 3 points At night, the temperature close to the ground is(colder/warmer), and the temperature higher up is (colder/warmer). As a result, the speed of sound high from the ground is (slower/faster) than the speed close to the ground, and the sound wave is refracted or bent back towards the ground.

Explanation / Answer

the distance from the point where the thunder isgenerated to the observer be = d

then the timetaken by the sound wave to reach the distance 'd'
is = 4sec
if 340m/s is the velocity of the sound wave
d = v*t
= 340 m /s* 4sec
= 1360 m

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