1. A space probe is leaving the solar system at 0.20 c , moving directly away fr

Question

1. A space probe is leaving the solar system at 0.20 c , moving directly away from Earth. It emits radio pulses at the rate of 70 per minute.

Part A

At what rate are the pulses received at Earth?

2. A toy balloon is filled with helium gas (He ) at 1 atm and 28?C .

Part A

If the volume of the balloon is 0.022m3 , how many atoms does it contain?

3. A piece of iron is heated to 900?C .

Part A

What is the median wavelength of its blackbody radiation?

Part B

What temperature would give a median wavelength of half of what you found in part A?

Explanation / Answer

  Speed of e.m.radiations is independent of the speed of the source. Once emitted it will travel with a speed of c =3e8m/s .

Frequency of the pulse = 70/60 = (1.167)
The frequency as observed by the observer is c*(1.167) / ( c+0.20c) = 0.9725 Hz
= 59.07 pulses per minute

.

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