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Edexcel PHYSICS Doubts

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Meticulous:
Amplitude=max displacement

ikh:

--- Quote from: ~ A.F ~ on May 31, 2010, 04:12:58 pm ---Amplitude=max displacement

--- End quote ---

i do reliase amplitude = displacment but how do you measure the amplitude in this graph (this is not a transverse graph but a longitudinal one displayed as a sinisoudial one) please explain how exactly to measure.

Thanks in advance

ikh:
plz help it is an important qs....

vanibharutham:
@ ikh

Longitudinal waves have compressions and rarefactions and im sure you know that the distance between the centres of two compression or two rarefactions is the wavelength.

However, to work out amplitude you must know that at the centre of the rarefaction or at the centre of a compression the displacement is zero. Using that and the slinky given at the rest position, you can work out the distance between the maximum displacement of the slinky.

vanibharutham:
@ anyone:

When Supernova 1987A was detected on Earth, neutrinos emitted in the explosion arrived about 20 hours earlier than the light, even though both were created at the same instant. How is this consistent with the idea that nothing can travel faster than the speed of light? (Hint: space is not empty)

What I'm guessing, though not sure, is that because "space is not empty" the light rays must be refracting in the somewhat denser medium and must be slowing down. However, the neutrinos, being particles, must have sped up and thus reached the earth before the light reached us. However, since nothing is faster than the speed of light, neutrinos only reached the earth because light slowed down, the consistency of the idea that nothing can travel faster than light is true.

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