S2003-Final

# S2003-Final - PHYSICS 112 EXAM 4(first part of final exam...

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PHYSICS 112 - EXAM 4 (first part of final exam) - SPRING 2003 Use only a right-handed coordinate system ( along thumb, forefinger, and Bß Cß D middle finger of your right hand when these three fingers are perpendicular to one another). Show your calculations to get full credit. Be sure to include correct units. 1. [6 points total] A two-slit system consists of two slits, each of width , whose centers are + separated by a distance 4 . .œ + (a) [2 points] What is sin for the angle corresponding to the eleventh diffraction ) minimum? (b) [2 points] What is sin for the angle corresponding to the seventh interference ) maximum? (c) [2 points] What number interference maximum coincides with the third diffraction minimum? 2. [4 points] Light polarized parallel to the axis is passed through two polarizers, B first one with its transmission axis along at an angle of 135° (measured counterclockwise from the axis), and then one with its transmission axis at an angle of 105° (measured B the same way). Determine the fraction of the initially polarized light that passes through each polarizer: Through the first polarizer ( 135°): ________________________________ ) œ Through the second polarizer ( 105°): _____________________________ ) œ 3. [10 points] Light of wavelength 650 nm is incident almost normally from air onto a thin oil film ( 1.30) which is 500 nm thick which is floating on water ( 1.33). (a) [1 point] What is the approximate color of this light? (b) [2 points] What is the frequency of this light? (c) [2 points] What is the speed of light waves in the oil? (d) [2 points] What is the wavelength of this light in the oil? (e) [3 points] Will an observer in the air looking at the reflected light beams see constructive or destructive inteference? Be sure to show your calculation.

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4. [4 points] What is the energy, in eV and in joules, for a reddish photon corresponding to light of wavelength 650 nm? - œ Energy in eV: Energy in joules: 5. [4 points] An atom has three energy levels which we will denote A, B, and C. The energies of A, B, and C are, respectively, 0.40 eV, 3.75 ev, and 8.85 eV.  (a) The maximum energy of a photon in a transition from one of these levels to emitted another is: (b) The minimum frequency of a photon emitted in a transition from one of these levels to another is: 6. [9 points] Consider this isotope of tin: Sn 50 120 Þ This isotope consists of __________ electrons, _________neutrons, and _________ protons. In its nucleus are a total of __________ quarks. This tin isotope above is the most abundant one in nature. The second most abundant differs only in having two fewer neutrons in its nucleus. The symbol for the atom for this second isotope is: _______________________ . 7. [3 points] A radioactive isotope of mercury is Hg which decays into platinum 80 180 ß (symbol: Pt) by alpha-decay and has a half-life of about 6 seconds. Write down the formula for this radioactive decay.
PHYSICS 112 - EXAM 4 Solutions - SPRING 2003 Use only a right-handed coordinate system ( along thumb, forefinger, and Bß Cß D middle finger of your right hand when these three fingers are perpendicular to one another).

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S2003-Final - PHYSICS 112 EXAM 4(first part of final exam...

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