21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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If a luminous object were moved to one-half the original distance, it would appear   a. one-half as bright.   b. just as bright.   c. twice as bright.   d. four times brighter.   e. eight times brighter.
What will be the effect on the spectral lines of an object if it is moving only perpendicular to your line of sight?   a. They will be redshifted.   b. They will be blueshifted.   c. They will be split.   d. They will be broadened.   e. There would be no effect.
6. An object with a temperature of 5,000 K emits an electromagnetic (EM) flux of 50 nanowatt. Apply the blackbody radiation law to calculate approximate EM flux emitted by this body if its temperature is changed to 18,000 F.
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