If a source of light is approaching us at 3,000 km/sec, then all its waves are

Increasing the temperature of a blackbody by a factor of 3 will increase its energy by a factor of

Increasing the temperature of a blackbody by a factor of 3 will increase its energy by a factor of

If a source of light is approaching us at 3,000 km/sec, then all its waves are

If a star was the same size as our Sun, but was 81 times more luminous, it must be

The radiation our eyes are most sensitive to is the color

Green light has a shorter wavelength than orange light. In a 5-inch telescope, green light will

A jar filled with gas is placed directly in front of a second jar filled with gas. Using a spectroscope to look at one jar through the other you observe dark spectral lines. The jar closest to you contains

The force of gravity varies with the

Which of these was NOT seen telescopically by Galileo?