None of the pulsars emit pulses of visible light because
a. pulsars are too hot to emit visible light.
b. pulsars contain black holes that won't let visible light escape.
c. the gravitational field of a pulsar is so great that the visible light emitted is redshifted.
d. pulsars are too far away for the visible light to be bright enough to be detected at Earth.
e. A few pulsars do emit visible light pulses.
e
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The huge, dark, almost spherical regions between the superclusters of galaxies are called ________
Fill in the blank(s) with correct word
) A 100-W lamp glows brighter than a 25-W lamp. The electrical resistance of the 100-W lamp is
A) less. B) greater. C) the same.
Have objects like Jupiter been found? How?
A. No, only Earth-like planets have been found. B. Yes, cool Jupiters have been found from the microlensing method. C. No, only Mars-like planets have been found. D. Yes, hot Jupiters have been found from the radial velocity method. E. Yes, warm Jupiters have been found from the transit method.
Fused quartz has an index of refraction of 1.50 for light from a 678-nm source. What is the speed of light for this wavelength within the quartz? (c = 3.00 × 10^8 m/s)
a. 1.50E+8 m/s b. 2.00E+8 m/s c. 2.45E+8 m/s d. 1.33E+8 m/s e. 1.50E+8 m/s