I take two pictures of my dog Kaycee. I use the same film and level of illumination for both pictures, but I halve the f-number for the second picture. By what factor will the required time of exposure change if the film is to receive the same total light energy?
a. 4.0
c. 2.0
b. 0.50
d. 0.25
D
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Cepheid variable stars have pulsation periods of _____
A) 1 to 60 days B) 80 to 140 days C) 150 to 210 days D) 230 to 290 days
Why are Earths and super-Earths in the habitable zones of their stars of special interest?
What will be an ideal response?
The modification of the standard Big Bang theory is known as the
a. cosmic model. b. Hubble-Leavitt model. c. inflationary model. d. Hertzsprung-Russell model.
When the sum of the external forces and the sum of the external torques on a body are both zero, we can conclude that
a. the body is moving at constant velocity but is not rotating. b. the body is rotating at constant angular velocity but has no linear velocity. c. the body has neither linear nor angular velocity. d. the body may have constant linear or angular velocity, but not both simultaneously. e. the body may have constant linear or constant angular velocity, or both simultaneously.