Calculate the fraction per mm2 area of 7.7-MeV α particles scattered at 45° from a gold foil of thickness 2.1 x 10 -7 m at a distance of 1.0 cm from the target.
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Calculate the fraction per mm2 area of 7.7-MeV α particles scattered at 45° from a gold foil of thickness 2.1 x 10 -7 m at a distance of 1.0 cm from the target.
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- In an experiment done by scattering 5.5-MeV ∝ particles from a thin gold foil, students fi nd that 10,000∝ particles are scattered at an angle greater than 50°. (a) How many of these particles will be scattered greater than 90°? (b) How many will be scattered between 70° and 80°?A beam of α particles of kinetic energy E = 10 MeV and intensity I = 1 μ A hits a lead target [A = 207, Z = 82, ρ = 1.14 x 104 kg m-3] of thickness t = 0.2 mm. We locate a counter of area S = 1 cm2 at a distance of l = 0.5 m beyond the target at the angle θ = 40°. Neglecting, when necessary, the variation of the angle on the detector find: (a) the number of incident particles per second Ri, (b) the solid angle ΔΩ under which the target sees the detector, (c) the differential cross-section at the detector, and (d) how many hits the detector counts per second.A flat polystyrene-air ion chamber with 1-mm plate separation is positioned with the inner surface of its front wall at a depth of 2.0 g/cm2 in a polystyrene phantom. A beam of 15-MeV electrons incident on the phantom makes a charge reading of 6.42 x 10-8 C, where p = 765 torr, T = 25.2°C, and the ion col- lection efficiency is 0.973. (a) What is the absorbed dose in the cavity air, known to have a mass of 4.31 10. x 10-* g? (b) What is the absorbed dose in the polystyrene at 2-g/cm² depth? Ans: (a) 5.20 Gy (b) 5.04 Gy
- Nuclear radii may be measured by scattering high-energy electrons from nuclei. (a) What is the de Broglie wavelength for 172 MeV electrons? (b) Are these electrons suitable probes for this purpose? (a) Number Units (b)H IS mear atenualion coeiciem (17m). PROBLEMS 1. Find maximum frequency and minimum wavelength of X-ray radiation, if the potential difference between cathode and anode was (a) Ual = 3 kV and Ua2 = 15 kV. 2 The 10-fold X-rav reduction values for (a) water (h).concreate (c) iron and (d) lead are equalA proton is fired from very far away towards a nucleus with charge Q = 120 e, where e is the electronic charge. It makes a closest approach of 10 fm to the nucleus. The de-Broglie wavelength (in units of fm) of the proton at its start is [Take the proton mass, mp = (5/3)× 10-²7 kg; h/e= 4.2 × 10-¹5 р J-s/C: 1 ATTEO = 9× 10⁹ m/F; 1 fm = 10-¹5 m] (2013 Adv.)
- Geiger and Marsden (1909) observed backward-scattered (θ ≥90°) α particles when a beam of energetic α particles was directed at a piece of gold foil as thin as 6.0 x 10-7 m. Assuming an α particle scatters from an electron in the foil, what is the maximum scattering angle?In the 1980s, the term picowave was used to describe food irradiation in order to overcome public resistance by playing on the well-known safety of microwave radiation. Find the energy in MeV of a photon having a wavelength of a picometer.If an average of 10000 photons are detected per mm2 the probability of detecting between 9800 and 10200 counts in any exposed mm2 is approximately: a) 59 b) 75 c) 89 d) 95 e) 99
- Calculate the resonance frequency and the corresponding wavelength for an electron in a magnetic field of 0.330 T, the magnetic field commonly used in EPR.A circuit employs a silicon solar cell to detect flashes of light lasting 0.25 ss. The smallest current the circuit can detect reliably is 0.33 μA Assuming that all photons reaching the solar cell give their energy to a charge carrier, what is the minimum power of a flash of light of wavelength 590 nmnm that can be detected? P=In lead, how many Compton scattering interactions occurred? there are 10^10 photons with 1 MeV energy incident onto a lead shield with 1cm thickness.