A helium-neon laser (? = 632.8 nm) is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.5°, what is the line spacing, d?
a. 1.81 × 10^?6 m
b. 1.00 × 10^?5 m
c. 1.00 × 10^?4 m
d. 1.31 × 10^?6 m
e. 6.76 × 10^?7 m
a
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A wire carries a steady current of 0.30 A over a period of 20 s. What total charge passes through the wire in this time interval?
a. 67 C b. 20 C c. 6.0 C d. 0.015 C e. 0.30 C
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.
If a metal contains 1028 free electrons, the number of different quantum states (nx, ny, and nz) is equal to:
(a) 1028 (b) 2×1028 (c) 0.5×1028 (d) 1
An electric device, which heats water by immersing a resistance wire in the water, generates 50 cal of heat per second when an electric potential difference of 12 V is placed across its leads. What is the resistance of the heater wire? (Note: 1 cal = 4.186 J)
a. 0.94 W b. 0.81 W c. 0.58 W d. 0.69 W e. 1.5 W