According to the Hubble law, the relationship between the distances to galaxies and the apparent velocity of recession is _____
A) linear
B) exponential
C) quadratic
D) inverse
A
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Atoms that have the same number of protons but a different number of neutrons are called
a. ions. b. molecules c. atomic pairs. d. nuclear pairs. e. isotopes.
When a metal surface is illuminated with light of wavelength 437 nm, the stopping potential for photoelectrons is 1.67 V. (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, e = -1.60 × 10-19 C, 1 eV = 1.60 × 10-19 J, mel = 9.11 × 10-31 kg)
(a) What is the work function of the metal, in eV? (b) What is the maximum speed of the ejected electrons? What will be an ideal response?
A uranium atom is 238 times as massive as a hydrogen atom. Compared with the diameter of a hydrogen atom, uranium's size is
A) slightly smaller. B) only slightly larger. C) is much larger, but less than 238 times as large.
Which of the following extrasolar planets would be easiest to detect using the Doppler shift method?
A) a massive planet far from its parent star B) a low mass planet far from its parent star C) a low mass planet close to its parent star D) a massive planet close to its parent star