A. doppler effect B. ultrasonic C. timbre D . decibels
2006-08-16 02:32:14 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Other - Science
A doppler
2006-08-16 02:39:07 · answer #1 · answered by female_lizzzzzard 3 · 0⤊ 2⤋
This is an interesting question and one I think would require a bit of thinking. My first thought was doppler effect but then I re-read the question. Doppler effect is the changing in the pitch of the sound as the object making the sound moves in a direction toward or away from the listner. This is a very measurable effect and it the science that allows police radar (non laser) guns work. However, the doppler effect relates to the pitch of the sound, not the volume. The question reads 'louder due to what' and louder relates to volume not pitch. My second thought was decibels, but I have hard time convincing myself that is the correct answer as decibles is the unit of measure of sound much like inches or centimeters are measurements of distance. I ruled out ultrasonic because that describes a type of sound waves and more specifically sound waves that are outside the range of human hearing. I then considered Timbre but didn't know what that meant... so I looked it up. Timbre: "..that attribute of auditory sensation in terms of which a listener can judge that two sounds, similarly presented and having the same loudness and pitch, are different". Again this doesn't fit the question either as the definition itself states 'the same loudness and pitch' thus eliminating itself as the correct answer.
So I was back to decibels as the best answer so I looked it up as I was questioning my perception of what decibels are. Decibel: A unit used to express relative difference in power or intensity, usually between two acoustic or electric signals, equal to ten times the common logarithm of the ratio of the two levels. This seems a lot closer but again this is a measurement of a ratio between two sounds (siren far away and siren closer) but doesn't quite fit the question of 'due to what'.
With all of this.. I think the answer that most correctly fits your question is decibels as it is the only answer that has specific ties to loudness.
Good luck and I hope this helps!
2006-08-16 02:58:22 · answer #2 · answered by wrkey 5 · 2⤊ 0⤋
It's Decibels.
We deal with this all of the time with fire alarms. We have to use a decibel meter to make sure the device, which can be 50 feet away is still making a loud enough noise to alert the space. Obviously, the closer you are the louder it is. The measure of sound's intensity is it's Decibel rating.
Doppler effect deals with the "pitch" of a sound due to compression of the sound waves. Not the "loudness."
2006-08-16 08:11:17 · answer #3 · answered by todvango 6 · 1⤊ 0⤋
As mentioned by others it is known as Doppler effect. It states that the frequency of the waves increase as the source approaches an observer and reduces as it recedes. This phenomena is used to measure the distance of the stars etc.
2006-08-16 02:54:32 · answer #4 · answered by PBVenkat 2 · 0⤊ 1⤋
A. Doppler effect.
This is the reason why ambulances and fire trucks use that special type of sirens to get everyone's attention and warn everyone that it is getting nearer and nearer.
Extensive research has been done to come up with that type of sirens.
Same can be said about trains and the whistles you hear. Stand stationary when the train passes. You will see why.
2006-08-16 02:40:29 · answer #5 · answered by Nightrider 7 · 0⤊ 1⤋
A) Doppler shift
2006-08-16 02:38:00 · answer #6 · answered by Iridium190 5 · 0⤊ 1⤋
A. doppler effect
2006-08-16 03:06:10 · answer #7 · answered by Anonymous · 0⤊ 1⤋
decibels. due to energy level vs. distance relationship.
2006-08-16 03:09:49 · answer #8 · answered by Anonymous · 1⤊ 0⤋
a
2006-08-16 04:30:16 · answer #9 · answered by shiara_blade 6 · 0⤊ 1⤋