The principal quantum number n can have any integer value ranging from
A) -? to +?.
B) 0 to ?.
C) 1 to ?.
D) 1 to 100.
C
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What is the wavelength in the Balmer series for n = 15?
A) 277.1 nm B) 371.1 nm C) 188.6 nm D) 656 nm E) 754.2 nm
Determine (a) the temperature at the 16 equally spaced points shown in the accompanying sketch to an accuracy of three significant figures and (b) the rate of heat flow per meter thickness. Assume two-dimensional heat flow and k = 1 W/(mK).
GIVEN
A two-dimensional object with specified surface temperatures
FIND
(a) The temperature at the 16 specified locations
(b) The heat flow per meter thickness
ASSUMPTIONS
Steady state
SKETCH
Pressure in a Liquid: A water tank is filled to a depth of 10 m, and the bottom of the tank is 20 m above ground. A water-filled hose that is 2.0 cm in diameter extends from the bottom of the tank to the ground, but no water is flowing in this hose. The water pressure at ground level in the hose is closest to which of the following values? The density of water is 1000 kg/m3.
A. 3.9 × 105 N/m2 B. 2.0 × 104 N/m2 C. 9.2 N/m2 D. The question cannot be answered because the cross sectional area of the tank is needed.
It is possible to hear an approaching train before you can see it by listening to the sound wave through the track. If the elastic modulus is 2.0 × 10^11 N/m2 and the density of steel is 7.8 × 10^3 kg/m3, approximately how many times faster is the speed of sound in the track than in air? (vair ? 340 m/s.)
a. 20 b. 5 c. 10 d. 15 e. 25