The location of a star in the H-R diagram indicates its temperature and intrinsic brightness
a. True
b. False
Indicate whether the statement is true or false
True
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The ionosphere is a layer of ionized gas that is
A) above the exosphere. B) between the thermosphere and the exosphere. C) within the thermosphere. D) within the stratosphere. E) within the troposphere.
For Newton's third law, the action and reaction forces are equal in ______________ and opposite in direction
Fill in the blank(s) with correct word
Put one of your thumbs at arm's length in front of your face. Now focus on something in the background and look through one eye at a time. What do you notice about your thumb?
A. It appears to move more when it's closer. B. It appears to move less when it's closer. C. It appears to move the same when it's closer. D. It disappears entirely when it's closer! E. None of the above.
An incandescent bulb emits what kind of spectrum?
A. emission-line B. blueshifted C. continuous D. absorption-line E. redshifted