What is the rms speed of a helium atom:
(a) at 5. K?
(b) at -196.° C (the boiling point of N2)?
(c) at 100.° C?
(a) 176. m/s
(b) 692. m/s
(c) 1.52 × 103 m/s
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Interferometry
a. is used to improve the resolving power. b. decreases the chromatic aberration of a telescope. c. works only for large x-ray and ultraviolet telescopes. d. requires that radio telescopes be within a few hundred feet of each other. e. none of the above
Resistance and Resistivity: A 120-m long metal wire having a resistivity of 1.68 × 10-8 ? ? m has a resistance of 6.0 ?. What is the diameter of the wire?
A. 0.065 mm B. 0.65 mm C. 0.65 cm D. 0.65 m
The acceleration due to gravity has the same value for all free-falling objects, regardless of their mass or weight
Indicate whether the statement is true or false
What resolving power must a diffraction grating have in order to distinguish wavelengths of 686.30 nm and 687.50 nm? (1 nm = 10?9 m)
a. 343 b. 572 c. 686.9 d. 915 e. 687.5