4. Relativistic Doppler shift: A spaceship with speed v close to c is moving away from Earth. At regular intervals of time, Ať', (as measured in the ship's frame), it sends out a light pulse. (a) In the inertial reference frame in which Earth is at rest, give the equation for the time interval between successive pulses being emitted? (b) In the inertial reference frame in which Earth is at rest, what give the equation for the time interval between successive pulses arriving at Earth? Give the answer in terms of v, c and At'. (c) If we convert the arrival time interval into a frequency, via f = 1/At, show that

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4. Relativistic Doppler shift: A spaceship with speed v close to c is moving away from Earth.
At regular intervals of time, At', (as measured in the ship's frame), it sends out a light pulse.
(a) In the inertial reference frame in which Earth is at rest, give the equation for the time
interval between successive pulses being emitted?
(b) In the inertial reference frame in which Earth is at rest, what give the equation for the
time interval between successive pulses arriving at Earth? Give the answer in terms of
v, c and At'.
(c) If we convert the arrival time interval into a frequency, via f = 1/At, show that
1 -
fs,
farrival
1+v/cs»
where f = 1/Ať. (This is the formula for the relativistic Doppler shift, by which the
light from distant galaxies, moving at relativistic speeds away from us, is red-shifted.)
(d) Use the formula from part (c) to find the speed v at which blue light with frequency
650 x 1012 Hz, emitted by the spaceship, will be received on Earth as red light with
frequency 400 x 1012 Hz.
Transcribed Image Text:4. Relativistic Doppler shift: A spaceship with speed v close to c is moving away from Earth. At regular intervals of time, At', (as measured in the ship's frame), it sends out a light pulse. (a) In the inertial reference frame in which Earth is at rest, give the equation for the time interval between successive pulses being emitted? (b) In the inertial reference frame in which Earth is at rest, what give the equation for the time interval between successive pulses arriving at Earth? Give the answer in terms of v, c and At'. (c) If we convert the arrival time interval into a frequency, via f = 1/At, show that 1 - fs, farrival 1+v/cs» where f = 1/Ať. (This is the formula for the relativistic Doppler shift, by which the light from distant galaxies, moving at relativistic speeds away from us, is red-shifted.) (d) Use the formula from part (c) to find the speed v at which blue light with frequency 650 x 1012 Hz, emitted by the spaceship, will be received on Earth as red light with frequency 400 x 1012 Hz.
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