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A parallel beam of 1-MeV photons is normally incident on a 1.2-cm aluminum slab (ρ =...

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Physics

  1. A parallel beam of 1-MeV photons is normally incident on a1.2-cm aluminum slab (ρ = 2.70 g cm–3 ) at a rate of103 s–1 . The mass attenuation and massenergy- absorption coefficients are, respectively, 0.0620cm2 g–1 and 0.0270 cm2g–1.
    1. What fraction of the photons is transmitted withoutinteracting?
    2. What fraction of the incident photon energy is transmittedby the slab?
    3. How much energy is absorbed per second by theslab?
    4. What fraction of the transmitted energy is carried by theuncollided photons?
    5. If the mass energy-transfer coefficient is 0.0271cm2 g–1, what fraction of the initial kineticenergy transferred to the electrons in the slab is emitted asbremsstrahlung?

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