Velocity Addition: A spaceship traveling at 0.50c away from Earth launches a secondary rocket in the forward direction at 0.50c relative to the spaceship. As measured by Earthlings, how fast is the secondary rocket moving away from Earth?
A. 0.90c
B. 0.50c
C. 0.80c
D. 0.70c
E. c
Answer: C
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Based on the curves shown here, which of the following statements best describes how we can distinguish a massive star supernova from a white dwarf supernova?
A) A white dwarf supernova is brighter at its peak and over a few months fades more steadily than a massive star supernova. B) For a few seconds, a white dwarf supernova is brighter than a massive star supernova, but after that the two look virtually identical. C) The spectrum of a massive star supernova has two major spectral lines, while a white dwarf supernova has only one. D) The two types of supernovae behave so similarly that we can only distinguish them by studying photographs of the systems taken before the explosions.
The identities of dark energy and dark matter are
A) unknown at this time. B) subjects of intense astronomical interest. C) both of these D) neither of these
A certain photon after being scattered from a free electron at rest moves at an angle of 120° with respect to the incident direction. If the wavelength of the incident photon is 0.591 nm, what is the energy of the scattered photon?
A) 1.05 × 10-16 J B) 2.10 × 10-16 J C) 5.71 × 10-16 J D) 3.34 × 10-16 J E) 4.21 × 10-16 J
Exclusion Principle: How many unique quantum states correspond to the lowest possible energy level of an electron in the hydrogen atom?
A. 3 B. 0 C. 1 D. 4 E. 2