Preliminary Physics Question: Types of Waves (1 Viewer)
- Thread starter Northey7
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Deliriously
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I have a question that is similar to this.
It's from the NSBHS 2004 prelim half yearlies
The energy that returns with an echo from a window, covered with fabric curtrains
a) is the same as the original wave
b) is less than the original wave
c) is more than the original wave
d) is impossible to measure
I think its B because the energy is being converted into sound from the echo and some is being absorbed by the curtains.
Is that correct? :S
It's from the NSBHS 2004 prelim half yearlies
The energy that returns with an echo from a window, covered with fabric curtrains
a) is the same as the original wave
b) is less than the original wave
c) is more than the original wave
d) is impossible to measure
I think its B because the energy is being converted into sound from the echo and some is being absorbed by the curtains.
Is that correct? :S
Yep, B is definitely correct, and your reasoning is right too.
For the explosion, the noise is sound, which is also a pressure wave. This wave is created by the force of the explosion (expanding gases), and travels outwards from the explosion. You hear the sound when the pressure wave reaches you, and once the wave has passed, the noise stops (it will keep traveling and the energy of the wave will eventually be completely absorbed by the medium and other objects).
For the explosion, the noise is sound, which is also a pressure wave. This wave is created by the force of the explosion (expanding gases), and travels outwards from the explosion. You hear the sound when the pressure wave reaches you, and once the wave has passed, the noise stops (it will keep traveling and the energy of the wave will eventually be completely absorbed by the medium and other objects).