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Unformatted text preview: ter reﬂection, what is the speed
of the car? Is it moving away or towards the speed detector?
4. An X-Ray photon has an energy of 124 keV. What is its wavelength?
5. A radioactive isotope has half-life of 9 months. After three years what
fraction of this isotope will be left?
6. A 3 MeV gamma ray is emitted by a lead nucleus. By how much is the
mass of the nucleus reduced? Solutions
1. The delay must compensate for the extra distance travelled by one of the
signals. By drawing a triangle with two vertices at the telescopes and one side
pointed towards the obje...
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- Spring '08