Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. A light ray that reflects from mirror 1 at angle ?M1 then strikes the second mirror and reflects at ?M2 such that the angle between the ray reaching mirror 1 and the ray leaving mirror 2 is 180°. The angle between the two mirrors is
a. 0°.
b. 45°.
c. 90°.
d. 150°.
e. 235°.
c
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One light-year is approximately
A) the distance from the Sun to Earth. B) the speed at which Earth orbits the Sun. C) 10 trillion kilometers. D) the same as one regular year.
The surface of Venus is hotter than the surface of Mercury because:
a) Venus is smaller than Mercury so it does not require so much energy to heat it. b) of the volcanic activity that occurs on Venus. c) Mercury's atmosphere prevents radiation from penetrating through to its surface. d) Venus is closer to the Sun than Mercury. e) Venus is more massive and is able to retain a thick atmosphere.
Alpha, beta, and gamma particles are all deflected by a magnetic field
a. True b. False Indicate whether the statement is true or false
Which type of weather is characterized by spiral storms with winds of up to 300 km/hour?
A) hurricanes B) tornadoes C) tropical depressions D) tropical storms