What is the energy (in electron-volts) of the n = 3 state of atomic hydrogen?
What will be an ideal response?
-1.51 eV
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A ray of light is incident on a pane of common window glass at an angle of 35° to the normal. The angle of the reflected ray with respect to the normal is
1) 35° 2) 55° 3) 90° 4) 20° and the refracted ray within the glass may be at an angle of 5) 35°. 6) 55°. 7) 22°. 8) 75°.
What thermodynamic quantity is held constant in Boyle's law?
a. pressure b. volume c. temperature d. Both pressure and volume are each held constant.
Replot the data points of Figure 5.9(b) on log-log paper and find an equation approximating the best correlation line. Compare your results with Figure 5.10. Then, suppose that steam at 1 atm and 100°C is flowing across a 5-cm-OD pipe at a velocity of 1 m/s. Using the data in Figure 5.10, estimate the Nusselt number, the heat transfer coefficient, and the rate of heat transfer per meter length of pipe if the pipe is at 200°C and compare with predictions from your correlation equation.
GIVEN
Figure 5.9(b) in text
Steam flowing across a pipe
Steam pressure = 1 atm
Steam temperature (Ts) = 100°C
Pipe outside diameter (D) = 5 cm = 0.05 m
Steam velocity (U?) = 1 m/s
Pipe temperature (Tp) = 200°C
FIND
(a) Replot Figure 5.9(b) on log-log paper and find an equation approximating the best correlation line
(b) Find the Nusselt number (Nu), the heat transfer coefficient (hc), and the rate of heat transfer per
unit length (q/L) using Figure 5.10
(c) Compare results with your correlated equation
ASSUMPTIONS
Steady state
Radiative heat transfer is negligible
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 35, for steam at 1 atm and 100°C
Solenoid: An ideal solenoid 20 cm long is wound with 5000 turns of very thin wire. What strength magnetic field is produced at the center of the solenoid when a current of 10 A flows through it? (?0 = 4? × 10-7 T ? m/A)
A. 0.0063 T B. 0.20 T C. 3.2 T D. 4.8 T E. 0.31 T