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11838_HW1E1001

# 11838_HW1E1001 - 90.0 0 to the incident beam What is the...

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HOMEWORK-1 PHY112: Modern Physics and Electronics Q.1 Light strikes a sodium surface, causing photoelectric emission. The stopping potential for ejected electrons is 5.0 V, and the work function of sodium is 2.2 eV. What is the wavelength of the incident light? Q.2 .Consider a black-body of surface area 25.0cm 2 and temperature 5500K (a)How much power does it radiate?(b)At what wavelength does it radiate most intensely? Find the spectral power per wavelength at (c)this wavelength and at wavelength of (d) 1nm (an x-ray or gamma ray ) (e) 5nm (UV light or an x-ray ). Q.3 Gamma rays of photon energy 0.511 MeV are directed on to a aluminum target and are scattered in various directions by loosely bound electrons there.(a) What is wavelength of incident gamma rays? (b) What is the wavelength of gamma scattered at
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Unformatted text preview: 90.0 0 to the incident beam? What is the photon energy of the rays scattered in this direction? Q.4 If the de Broglie wavelength of a proton is 100fm , (a) What is the speed of the proton and (b) through what electric potential would the proton have to be accelerated to acquire this speed? Q.5 Neutrons travelling at 0.400 m/s are directed through a pair of slits having a 1.00mm separation.an array of detectors is placed 10.0 m from the slits.(a) What is the de-Broglie wavelength of the neutrons.(b) How far off axis is the first zero-intensity point on the detector array? Q.6 The position and momentum of a 1.00 keV electron are simultaneously determined. if its position is located to within 0.100nm ,what is the percentage of uncertainity in its momentum....
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