How fast do electromagnetic waves travel?
a. At the speed of sound.
b. At the speed of light.
c. At one-half the speed of light.
d. Six feet per day.
e. At varying speeds depending on the electric and magnetic oscillations.
b
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Dark dust clouds are cooler than their surroundings
Indicate whether the statement is true or false
A uniform beam with a mass of 120 kg and a length of 5.0 m rests on two supports, one at the left edge and one 3.0 m from the left edge. How close to the right edge can a 68-kg person walk along the beam without causing it to tip over?
A) 1.6 m B) 1.8 m C) 0.88 m D) 1.5 m E) 0.50 m
Explain how observations of white-dwarf supernovae provide information on the expansion of the universe when it was younger
What will be an ideal response?
Granulation is caused by:
A) shock waves in the corona. B) rising and falling currents of gas in and just below the photosphere. C) the solar wind flowing away from the corona. D) the temperature variability in the chromosphere, which causes sudden heating.