Is it moving away or towards the speed detector 4 an

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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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