why we can't used the sonar beam to know the distance between the earth and moon??
2007-07-21 15:20:19 · 12 answers · asked by Daireen 2 in Science & Mathematics ➔ Astronomy & Space
The answers are right, sound cannot travel in the vacuum between here and the moon. I think they left a reflector on the moon during one of the Apollo missions. They use this to reflect a laser beam directed from earth. By measuring how long it takes for the laser beam (light) to return they can calculated the distance very closely. I think like accurate to and inch or so, pretty good for a distance in the vicinity of 240,000 miles.
2007-07-21 15:34:37 · answer #1 · answered by andyg77 7 · 3⤊ 0⤋
SONAR is a term for sound echoing and rangeing. Sharp, short duration sound pulses are transmitted into the water and a receiver listens for returning echos from objects that the sound pulses might strike. The time for the sound pulse to travel outward and back to the receiver is converted into a quantity of distance (feet, meters, yards) and displayed on some kind of screen. Normal "Maximum" Ranges are on the order of ten to twenty miles for excellent equipment. Certain specialized equipment might process return echos at greater distances.
SONAR is not applicable in Earth - to - Moon distance measurements for the following reasons:
1.) Sound does not transmit in the vacuumn of space...no water medium.
2.) SONAR does not perform at distances of 250,000 Miles, the rough distance from Earth to Moon.
3.) RADAR is the choice you should consider because it uses radio pulses instead of sound pulses. Radio echos
returning from the surface of the Moon will be fairly weak
as a result of the uneven surface and long distances involved. However, signals are routinely bounced off of the Moon by Radio Amateurs.
2007-07-22 02:20:55 · answer #2 · answered by zahbudar 6 · 0⤊ 0⤋
Sonar is sound. Sound needs a medium to travel through (air, water, rock), something that allows the sonic waves to pass from one molecule to the next - that's how sound travels, by vibrating one molecule that vibrates the next one and so on.
And since there is no air or water or rock between the Earth and the moon (Earth's atmosphere only reaches a few hundred miles, not the thousands of miles to the moon), the sound wouldn't reach the moon.
2007-07-21 15:31:47 · answer #3 · answered by Anonymous · 2⤊ 0⤋
HA HA! Yeah...I agree with what everyone else said. Sound waves need a medium to travel though and outerspace doesn't quite offer that. THat's why sound waves travel so well through water. You could try using the parallax. You can triangulate the distance to the moon by using another object in space and the distance the earth moves in a certain time frame. But that's rather difficult for someone who isn't proficient with calculus. Just bounce a radio wave off of the moon and time it. CYA
2007-07-21 15:29:07 · answer #4 · answered by justask23 5 · 2⤊ 0⤋
Sonar uses sound waves. The time it takes for one wave to bounce back off an object and return to the source can be used to calucalte the distance.
Unfortunately, the vacuum of space cannot propagate sound waves. Sound waves are longitudinal, mechanical waves, which require particles to transfer energy over long distances. Hence if there are no particles, no sound can be transmitted,
This is the same reason why in space nobody can hear you scream...
2007-07-21 15:25:33 · answer #5 · answered by Tsumego 5 · 4⤊ 0⤋
Sonar "beams" are sound waves, and sound waves don't travel through space- they must have a medium to transmit through.
2007-07-21 15:22:45 · answer #6 · answered by Dan K 3 · 2⤊ 0⤋
Sonar is sound waves and therein a problem. Sound tends to spread out very fast and getting enought sound power to hit the moon and bounce back for measurement would be a trick. To get a volume of sound need you probable would need 10,000 of the bigest nukes on this earth all being fired at the same time. Of course you might blow the earth out of orbit.
2007-07-21 15:29:10 · answer #7 · answered by Questionable 3 · 0⤊ 3⤋
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2017-01-21 12:39:39 · answer #8 · answered by ? 3 · 0⤊ 0⤋
Yeah.Sound waves does not travel through vacuum.It needs air.Thats why we dont hear anything in space
2007-07-21 15:24:16 · answer #9 · answered by Ikmal 1 · 3⤊ 0⤋
sound can't travel through a vacuum (like space).
2007-07-21 15:23:37 · answer #10 · answered by lynn y 3 · 3⤊ 0⤋