Compton Scattering: X-rays with a wavelength of 0.00100 nm are scattered by free electrons at 130° from their original direction. What is the kinetic energy (in keV) of each recoil electron? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
993 keV
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Which of the following is a valid spin state q-vector? (If you are using the letters on the back cover, you can indicate more than one choice by pointing to several letters.)
A. 
B. 
C. 
D. 
E. None of the above
F. All of the above
Which of the following equations is the correct equation for converting a temperature in kelvins to the equivalent temperature on the Fahrenheit scale?
A. 
B. 
C. 
D. 
E.
As global warming progresses, the
A) landmasses will warm the most B) equatorial regions will warm the most C) polar regions will warm the most D) oceans will warm the most
A large 2.54-cm.-thick copper plate is placed between two air streams. The heat transfer coefficient on the one side is 28 W/(m2 K) and on the other side is 57 W/(m2 K). If the temperature of both streams is suddenly changed from 38°C to 93°C, determine how long it will take for the copper plate to reach a temperature of 82°C.
GIVEN
• A large copper plate between two air streams whose temperatures suddenly change
• Plate thickness (2L) = 2.54 cm = 0.0254 m
• The heat transfer coefficients are
? lch = 28 W/(m2 K)
? 2ch = 57 W/(m2 K)
• Air temperature changes from 38°C to 93°C
FIND
• How long it will take for the copper plate to reach a temperature of 82°C
ASSUMPTIONS
• The initial temperature of the plate is 38°C
• The plate can be treated as an infinite slab
SKETCH
