Sound Waves Questions and Answers

6 What is the maximum speed of a wave on a cable with length 50 m mass of 200 kg and a tension force of 1000 N applied to it 10 points

6 A water wave has a frequency of 2 Hz and there are 3 meters between each crest on the wave How fast is the wave moving

What is the speed of a wave on a cable of length 16 m and mass 70 kg that has a force of 300 N applied to it 8 28 m s 68 6 m s 0 52 m s O2 07 m s

What is the speed of a wave that has a frequency of 1300 Hz and a wavelength of 1 7 m 3757 m s 0 0013 m s 764 7 m s 2210 m s

5 Infer Elephants can communicate with each other by making sounds as low as 14 17 Hz Could an average person hear those sounds Why or why not

3 B The power output of a 75 piece orchestra radiated as sound is 70 0 W What is the intensity of these sound waves to a person who is sitting 25 0 m away

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 5 If the original mosquito is joined by a second nearby mosquito producing sound at 918 Hz you will hear a beat occurring at what frequency in hertz Laulima contains a unique randomized value for the second frequency Hz 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

Click to see additional instructions 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 4 What is the period of the sound waves in milliseconds 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 ms O

Assume the speed of sound to be 340 m s A bat flying at 1 05 m s chirps at a frequency of 10 3 kHz At the same time a mosquito is flying away from the bat at 1 00 m s A What is the frequency of the sound that returns to the bat B What would your answer be if the bat were not moving but hanging from a tree C If bats can detect a change in frequency as low as 1 00 Hz can the bat detect the mosquito Justify your answer

4 What is the speed of sound in air with a temperature of 269 K 10 points

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!

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?

Two submarines are underwater and traveling directly away from each other. Sub 1 has a speed of 12 m/s and sub 2 has a speed of 16 m/s. Sub 1 sends out a 1820-Hz sonar wave that travels at a speed of 1532 m/s. (a) Determine the frequency detected by sub 2 (to the nearest Hz). (b) Part of the sonar wave sent from sub 1 is reflected off of sub 2 and returns to sub 1. Determine the frequency sub 1 detects from this reflected wave (to the nearest Hz).

Which of the following can be true when playing the musical instrument harp? The shorter strings vibrate faster than the longer ones. The longer strings vibrate faster than the shorter ones. Both strings vibrate at the same rate. Only shorter strings vibrate while longer strings do not.

A driver travels northbound on a highway at a speed of 35 m/s. A police car, driving southbound, at a speed of 33 m/s approaches with its siren of original frequency of 1,602 Hz. What frequency does the driver detect after the police car passes far away him? (Consider speed of sound in air is 345 m/s.)

Define crescendo The amount of volces and how they work in cooperation with each other in a plece of music. Refers to the pattern of which a plece of music is composed. To gradually get louder The loudness or softness of music

As a train starts from rest and then accelerates down the track, coming toward me faster and faster, the speed of the sound waves coming toward me will be: Select one: a. equal to the normal speed of sound in air. b. slower than the normal speed of sound in air. c. slower and slower. d. some constant speed faster than the normal speed of sound in air. e. faster and faster.

Objects which share the same natural frequency will often set each other into vibrational motion when one is plucked, strummed, hit or otherwise disturbed. This phenomenon is known as a forced resonance vibration. Select one: True False

All musical instruments have a natural frequency or set of natural frequencies at which they will vibrate; each frequency corresponds to a unique standing wave pattern. Select one: True False

If a guitar string has a fundamental frequency of 250 Hz, what is the frequency of its third harmonic? Select one. a. 250 Hz b. 1000 Hz c. Any of the above could be true. d. 750 Hz e. 2000 Hz

The sitar, an Indian musical instrument, has a set of strings that vibrate and produce music, even though they are never touched by the player. These sympathetic strings are identical to the plucked strings that are mounted right above them. What is the vocabulary word that describes this phenomenon?

What is the approximate distance of a thunderstorm when you note a 6.2s delay between the flash of lightning and the sound of thunder? Assume the speed of sound in this humid air is 346m/s.

If a person yells (as opposed to whispering), then it will cause. Select one: a. the pitch of the sound to be higher b. the speed of the sound to be faster c. the loudness of the sound to be louder

Oscar the Grouch drops Slimey into a mine shaft 200 m deep. If the temperature is 15.0°C, how much time will elapse between the moment when the stone is released and the moment when the sound of the stone hitting the bottom of the mine shaft is heard?

21. Which of the following is produced when you exceed the speed of sound in air? A. Beats B. Moire Patterns C. Doppler Shift D. Sonic Boom E. Resonance

A submarine releases a frequency of 15000Hz that bounces off an enemy vessel. If the returning wave has a frequency of 19000Hz, is the enemy ship moving toward or away from the submarine?

Kiss FM Radio broadcasts at 102.5 on the dial. This stands for 102.5 Megahertz or 102,500,000 Hz. Radio I waves travel at the speed of light, which is 3.0 x10 m/s. What is the wavelength that Kiss FM uses to broadcast its music? 2. A sound wave travels at 350 m/s in the air. A distant horn is producing a note that has a frequency of 480 Hz. 2a. What is the period of the wave? 2b. What is the wavelength? 3. While on vacation you visit the Grand Canyon. You shout at the far wall and the sound returns after 4.0 seconds. The speed of sound that day was 351 m/s. The sound you made had a frequency of 385 Hz. 3a. How far was it to the far side of the canyon? 3b. What was its wavelength? 3c. What was its period? 4. A green dress reflects light that has a wavelength of 535 nm. 4a. Find the frequency of the waves. 4b. Find the period of the waves.

5. The distance between the 3rd and 6th nodes (3 sections) on a standing wave of a tuning fork is 82 cm. If the frequency of the waves is 32Hz, what is the temperature in the room? (This is a tricky one !) *

A open-closed pipe of length L has a fundamental frequency f. Which of the following changes would result in a new fundamental frequency that is higher (greater in value) than before. Increasing the temperature of the air Decreasing the temperature of the air Increasing the length of the tube Decreasing the length of the tube Closing Both Ends Opening Both Ends

In general, for the same frequency, a sound with larger amplitude (a) will have greater intensity and will be perceived as louder. (b) will have greater intensity and will be perceived as less loud. (c) will have less intensity and will be perceived as louder. (d) will have less intensity and will be perceived as less loud. (e) none of the above is true.

Kirk saw the space shuttle take off from its launch pad. He heard the ignition blast 15 seconds later. The frequency of the sound wave produced by the engine blast was 2000 Hz. Assume the speed of sound on that day was 340 meters per second. (a) Find the distance in kilometers that Kirk was from the launch pad. (b) What was the wavelength in meters of the sound wave produced by the engine blast?

An eagle flying at 28 m/s emits a cry whose frequency is 370 Hz. A blackbird is moving in the same direction as the eagle at 11.32 m/s. (Assume the speed of sound is 343 m/s). What frequency does the blackbird hear (in Hz) as the eagle approaches the blackbird?

12. The volume knob on a radio varies the resistance on a line that goes to the speakers. At a low volume the resistance is 10,000 ohms. At a high volume the resistance is 10 ohms If the stereo maintains 35 volts into the speaker then, what is the current at low volume? *

If the fundamental frequency of a string is 13 Hz, what is: H2 = H3 = H4= H5 =

The notes produced by a violin range in frequency from approximately 196 Hz to 2637 Hz. Find the maximum wavelength in air pro- duced by this instrument when the speed of sound in air is 345 m/s. Answer in units of m.

Find the minimum extra path travelled by wave from sources S₁, S2 in order, for observer at P, to detect maximum intensity if two sources are generating sound waves at frequency of 660 Hz in same phase. (Vsound = 330 m/s) 0.5 m 0.75 m 1.25 m 1m

An organ pipe open at both the ends is provided with a hole at the middle of the pipe. If speed of sound in air is 340 m/s and length of pipe is 17 cm, then fundamental frequency observed in the sound, produced in pipe is A. 1000 Hz B. 500 Hz C. 2000 Hz D. 1500 Hz