The units of impulse are equivalent to:
a. those of energy.
c. kg•m/s.
b. N•s.
d. those of force.
C
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Suppose that two stars are identical in every way; for example, same distance, same mass, same temperature, same chemical composition, and same speed relative to Earth, except that one star rotates faster than the other. Spectroscopically, how could you tell the stars apart?
A) The faster rotating star has wider spectral lines than the slower rotating star. B) The faster rotating star will have an emission line spectrum whereas the slower rotating star will have an absorption line spectrum. C) The peak of thermal emission will be at a shorter wavelength for the faster rotating star than for the slower rotating star. D) There is no way to tell the stars apart spectroscopically because their spectra will be identical.
What is the energy of a 633 nm photon?
A) 0.32 eV B) 3.14 eV C) 5.1 eV D) 1.96 eV E) 0.51 eV
A 10-kg block is pushed across a friction-free horizontal surface with a horizontal force of 20 N. The acceleration of the block is
A) 1 m/s2. B) 2 m/s2. C) 5 m/s2. D) 10 m/s2. E) none of the above
The experiment, which gave the first evidence for the existence of the atomic nucleus, involved which of the following?
a. X-ray scattering c. radioactive dating b. cosmic ray detection d. alpha scattering