At 96° F the saturation density of air is 0.04 kg/m3 . If the weather report says the relative humidity is 90 % when the temperature is 96°F, the humidity is
a. 10 %.
b. 0.9.
c. 0.004 kg/m3.
d. 0.036 kg/m3.
e. 0.04 kg/m3.
d
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Energy Levels: A hydrogen atom makes a downward transition from the n = 15 state to the n = 5 state. Find the wavelength of the emitted photon. (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 2.56 ?m B. 1.54 ?m C. 2.05 ?m D. 3.07 ?m
A grating has 450 lines per millimeter. What is the highest order m that contains the entire visible spectrum from 400 nm to 700 nm?
A) m = 2 B) m = 3 C) m = 4 D) m = 5 E) m = 6
Extrasolar planetary systems are similar to our solar system in all of the following ways, EXCEPT:
A) that planetary orbits are relatively coplanar. B) for the presence of hot Jupiters in some systems. C) that planets orbit in the same direction that their parent star rotates. D) that the systems contain interplanetary debris, such as comets or asteroids. E) None of these are dissimilar to our solar system.
A nuclear reaction, which gives off a total of 2.0 × 10^16 J of energy, expends how much mass in the process? (c = 3.00 × 10^8 m/s)
a. 2.2 kg c. 22 kg b. 180 kg d. 0.22 kg