When light illuminates a grating with 7000 lines per centimeter, its second order maximum is at 62.4°. What is the wavelength of the light?
A)
336 nm
B)
363 nm
C)
452 nm
D)
633 nm
E)
752 nm
D
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A situation known as "population inversion" is needed for lasing action. What does "population inversion" mean?
A. Electrons are in the -1/2 state. B. Excited atoms must be at the top of the laser tube. C. Excited atoms must be at the bottom of the laser tube. D. The number of excited states that are to emit photons are in greater number than the lower states at which the transition is ending. E. The number of lower states are in greater number than the upper states participating in the lasing action.
For safety reasons, a heat exchanger performs as shown in (a) of accompanying figure. An engineer suggests that it would be wise to double the heat transfer area so as to double the heat transfer rate. The suggestion is made to add a second, identical exchanger as shown in (b). Evaluate this suggestion, that is, show whether or not the heat transfer rate would double.
GIVEN
Case 1
Heat exchanger as shown above.
• Overall heat transfer coefficient times the transfer area (UA) = 40,000 kJ/(hr K)
• Heat capacity rates
? Ch = 80,000 kJ/(h K)
? Cc = 40,000 kJ/(h K)
• Entering temperatures
? Tb,in = 400 K
? Tc,in = 300 K Case 2 Two of the same heat exchanges as shown above in Figure B. FIND
• Does the heat transfer rate double?
ASSUMPTIONS
• Heat exchangers are simple counterflow geometry
A 2.00 kg pendulum bob on a string 1.50 m long, is released with a velocity of 4.00 m/s when the support string makes an angle of 30.0 degrees with the vertical. What is the angle with the vertical the bob makes at the highest point of its motion?
A. 85.3 degrees B. 71.2 degrees C. 60.3 degrees D. 56.7 degrees E. 45.0 degrees
Studies have shown that the ice located in the south pole of Mars is mostly ____
a. H2O b. NO2 c. CO2 d. O2 e. FeO2