A ___________ has a few million light-sensitive diodes in an array typically about a half-inch square
a. photometer
b. charge-coupled device
c. spectrograph
d. photographic plate
e. grating
b
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A hypothesis that has been repeatedly and rigorously tested and supported is known as a:
a. model b. testable prediction c. scientific method d. scientific theory e. result
Which of the following statements about the celestial sphere is not true?
A) The Earth is placed at the center of the celestial sphere. B) When we look in the sky, the stars all appear to be located on the celestial sphere. C) The "celestial sphere" is another name for our universe. D) The celestial sphere does not exist physically.
Nuclear fusion in stars is controlled by the dependence of density on mass
Indicate whether the statement is true or false
Two single charged ions moving perpendicularly to a uniform magnetic field (B = 0.40 T) with speeds of 5 000 km/s follow circular paths that differ in diameter by 5.0 cm. What is the difference in the mass of these two ions?
a. 2.6 × 10^-28 kg b. 6.4 × 10^-28 kg c. 3.2 × 10^-28 kg d. 5.1 × 10^-28 kg e. 1.1 × 10^-28 kg