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4.   When a sound from a source is refracted away from the surface of the earth, it gives an indication that the      A. air has high humidity. B. ground is cooling faster than the air. C. wind is
blowing in the direction of the sound. D. air is cooler than the ground.
B. wind is blowing in the direction of the sound
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Original conversation
User: 4.   When a sound from a source is refracted away from the surface of the earth, it gives an indication that the      A. air has high humidity. B. ground is cooling faster than the air. C. wind is blowing in the direction of the sound. D. air is cooler than the ground.

Weegy: B. wind is blowing in the direction of the sound
bananayumboat|Points 573|

User: 5.   If a string vibrates at the fundamental frequency of 528 Hz and also produces an overtone with a frequency of 1,056 Hz, this overtone is the      A. first harmonic. B. third harmonic. C. fourth harmonic. D. second harmonic.

User: 6.   The wavelength of a wave is the distance between      A. the crest and the following trough. B. the amplitude and the normal position. C. the rarefaction and the following compression. D. two consecutive crests.

Weegy: The wavelength of a wave is the distance between two consecutive crests. answer is B
ephraimzRN|Points 2278|

User: 7.   In a transverse wave that travels through a medium, the molecules of the medium vibrate      A. with smaller amplitudes than the molecules in a longitudinal wave. B. at twice the velocity of the molecules in a longitudinal wave. C. in the direction in which the wave travels. D. at right angles to the direction in which the wave travels.

Weegy: B. at right angles to the direction in which the wave travels. Longitudinal waves vibrate the medium in the same direction as the propogation of the wave.
lolai3|Points 50|

User: 8.   The part of the ear where sound wave compressions and rarefactions cause the eardrum to vibrate is the      A. auditory nerve. B. outer ear. C. middle ear. D. inner ear.

Weegy: The part of the ear where sound wave compressions and rarefactions cause the eardrum to vibrate is the C. middle ear.
debnjerry|Points 50420|

User: 9.   A wave with a period of 0.008 second has a frequency of      A. 125 Hz. B. 12.5 Hz. C. 800 Hz. D. 80 Hz.

Weegy: A. 125 Hz. A disturbance that propagates through space is called a wave. [ Periodic waves are characterised by crests(highs) and troughs(lows). The Time Period of a wave is the time taken for a wave to complete one cycle and come back to the position from where it started(0 or 2pi radians). The Frequency is how many cycles the wave completes in unit time(one second) called Hertz(Hz). Now if one cycle takes = 0.008 sec in one sec no of cycles = (1 sec / 0.008 sec) = 125 cycles/sec = 125 Hz ]
latefisher|Points 3420|

User: 10.   If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to have      A. an amplitude lower than the original amplitude. B. a pitch lower than the original pitch. C. a frequency higher than the original frequency. D. a period higher than the original period.

Weegy: If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to have D. a frequency higher than the original frequency.
may100|Points 2728|

User: 11.   The spreading of sound waves around openings in barriers is called      A. reverberation. B. diffraction. C. an echo. D. refraction.

Weegy: B. diffraction
shifa saleheen|Points 9966|

User: 12.   In a stringed musical instrument, the sound frequency of a particular string can be increased by      A. lengthening the string. B. increasing the string's thickness. C. tightening the string. D. loosening the string.

Weegy: A. tightening the string.
shifa saleheen|Points 9966|

User: 13.   If you were trying to build a soundproof room, which of the following materials would you choose in order to absorb the most sound?      A. Wood B. Concrete C. Heavy curtains D. Carpet

Weegy: If you were trying to build a soundproof room you need Carpet in order to absorb the most sound.
chinggay_0118|Points 831|

User: 14.   The function of the eardrum in the middle ear is to      A. collect the sound waves. B. vibrate with the frequency of the received sound. C. carry the sound energy to the brain. D. amplify the received sound.

Weegy: D. vibrate with the frequency of the received sound
shifa saleheen|Points 9966|

User: 15.   If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is      A. 40 degrees. B. 90 degrees. C. 80 degrees. D. 0 degrees.

User: 16.   A sound that's produced by a single wave at a constant frequency and with no overtones is called      A. a discordant sound. B. a pure sound. C. an average sound. D. a mellow sound.

Weegy: A] pure tone is the answer. source:
dedang|Points 28|

User: 17.   An overtone that's a whole number multiple of the fundamental frequency of a string is called a      A. scale. B. discordant sound. C. harmonic. D. pitch.

Weegy: A. harmonic. An overtone that's a whole number multiple of the fundamental frequency of a string is called harmonic.
migzptz|Points 7630|

User: 18.   In which one of the following locations can a person hear the echo of a sound?      A. Less than 33.2 meters behind the reflecting surface B. Less than 16.6 meters in front of the reflecting surface C. At least 33.2 meters behind the reflecting surface D. At least 16.6 meters in front of the reflecting surface





Weegy: C. wind is blowing in the direction of the sound.
Expert answered|rjeksdi|Points 0|

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W18.   Which one of the following groups of numbers includes all prime numbers?      A. 1, 3, 11, 23 B. 7, 17, 63, 67 C. 3, 11, 23, 31 D. 2, 3, 5, 15
Question
Updated 207 days ago|2/3/2015 4:58:35 AM
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3, 11, 23, 31includes all prime numbers.
Added 207 days ago|2/3/2015 4:58:35 AM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by jeifunk [2/3/2015 7:17:22 AM]
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