A totally eclipsed Moon glows coppery red because
a. the Moon's surface is made of iron ore which is red in color.
b. red light is cooler than blue light.
c. during a lunar eclipse the Sun is cooler than normal and its light is more red.
d. only red light is able to pass completely through Earth's atmosphere and reach the Moon.
e. the Moon appears red during a total solar eclipse, not a total lunar eclipse.
d
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Equipotentials are lines along which
a. the electric field is constant in magnitude and direction. b. the electric charge is constant in magnitude and direction. c. maximum work against electrical forces is required to move a charge at constant speed. d. a charge may be moved at constant speed without work against electrical forces. e. charges move by themselves.
Which statement is NOT true about open clusters?
A. After a molecular cloud has collapsed and formed many stars, the cloud dissipates and the stars spread out into an open cluster. B. Open clusters are gravitationally bound and therefore have a spherical shape. C. Open clusters typically contain dozens to hundreds of stars. D. Open clusters usually contain many blue stars.
The Doppler technique for planet detection has found Earth-like planets around nearby Sun-like stars
Indicate whether the statement is true or false
On a PV diagram where pressure is in atmospheres and V is in liters the area is measured in liter- atmospheres. What is the number of Joules in 1.00 liter-atmosphere?
A. 101.3 B. 83.1 C. 65.2 D. 22.4 E. 15.7