Sound Waves Questions and Answers

Most people have experienced the Doppler shift and sound waves, but humans dont have direct experience with the Doppler shift and light waves. Why? The human nervous system is not sensitive enough to detect the doppler shift in light waves Only light from stars is subject to the Doppler shift. Earth's atmosphere blocks the Doppler shift. The Doppler shift is too large for humans to perceive.

A wave makes 54 vibrations in exactly 1 minute. What is its frequency? A) 2.25 Hz (B) 1.80 Hz (C) 0.45 Hz (D) 0.90 Hz

Questions # 3-5: On a hot, sultry day, a mosquito's wings are producing annoying 912-Hz sound waves as it hovers near your ear. The speed of sound in air on this day is 344 m/s. 3. What is the sound's wavelength, in centimeters? cm Calculate and enter your final answer to at least 3 significant figures. There is no penalty for including too many significant figures, but rounding to too few sig figs may cause Laulima to judge your answer to be wrong. - Do NOT enter units with your answer; enter only a numerical response. Laulima will count non-numerical answers as incorrect. Partial credit is NOT possible.

On a standard day the speed of sound is 345 meters per second. A whistle whose frequency is 725 Hz is moving toward an observer at a speed of 25.2 meters per second. What is the wavelength of the sound at the observer? (a) 0.367 m (b) 0.441 m (c) 0.511 m (d) 0.623 m

Two identical loudspeakers 2.50m apart are emitting sound waves into a room where the speed of sound is 340m/s. Abby is standing 4.50 m in front of one of the speakers, perpendicular to the line joining the speakers, and hears a maximum in the intensity of the sound. What is the lowest possible frequency of sound for which this is possible? Don't forget to include units for your answer!

Two identical loudspeakers 2.50m apart are emitting sound waves into a room where the speed of sound is 340m/s. Abby is standing 4.50 m in front of one of the speakers, perpendicular to the line joining the speakers, and hears a maximum in the intensity of the sound. What is the lowest possible frequency of sound for which this is possible? Don't forget to include units for your answer!

What beat frequency will you hear if you place a 323 Hz tuning fork and 329 Hz tuning fork that are both vibrating near each other? A. 652 Hz B. -6 Hz C. 20 Hz D. 12 Hz E. 6 Hz

A giant sea monster chases a deep sea submarine near the bottom of the North Atlantic. The submarine is moving at 30 m/s. The sea monster sends out a sonar signal (sound) of frequency 1000 Hz. The signal received by the sub has a frequency of 985 Hz. The speed of sound in saltwater is 1530 m/s. a. Determine the speed of the sea monster b. and if the sub is in trouble (yes or no).

Which one of the following would increase the speed of a sound wave in air? a. increasing the temperature of the air b.increasing the frequency of the sound wave C.increasing the intensity level of the sound wave d.increasing the amplitude of the sound wave

A friend of yours is loudly singing a single note at 363 Hz while driving towards you at 15 m/s on a day when the speed of sound is 336m/s (you are standing still). What frequency do you hear?

The G string on a guitar is 49 cm long and has a fundamental frequency of 196 Hz. A guitarist can play different notes by pushing the string against various frets, which changes the string's length. The ninth fret from the neck gives E (329.63 Hz); the tenth fret gives F (349.23 Hz). How far apart are the ninth and tenth frets?

When refraction of a wave occurs the __________of the wave changes. a. speed b. frequency c. wavelength d. period

If you were to build a pipe organ with open-tube pipes spanning the range from 45 Hz to 16 kHz. The speed of sound in air is 343 m/s. Part A. What would be the length of the shortest pipe required? Express your answer to two significant figures and include the appropriate units. Part B. What would be the length of the longest pipe required?

For a particular pipe in a pipe-organ, it has been determined that the frequencies 552 Hz and 621 Hz are two adjacent natural frequencies. Using 343 m/s as the speed of sound in air, determine the following. (a) fundamental frequency for this pipe (b) Is the pipe is open at both ends or closed at one end? open at both ends closed at one end (c) length of the pipe

Determine the intensity of a 120-dB sound. The intensity of the reference level required to determine the sound level is 1.0 x 10-12 W/m².

A fireworks shell explodes H = 120 m above the ground, creating colorful sparks. (Figure 1). Part A. How much greater is the sound level of the explosion for a person at a point directly below the explosion than for a person a horizontal distance of L=240 m away?