Which of the following observational techniques is most appropriate for measuring Doppler shifts?
A) spectroscopy (taking a spectrum)
B) imaging (taking a picture)
C) timing (measuring how the amount of light changes with time)
A) spectroscopy (taking a spectrum)
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A black hole is _____
a. an object so dense that light cannot escape its surface b. a neutron star that has exceeded the Chandrasekhar limit c. a theoretical model that has never been observed d. an observed object that is not well understood e. the result of a neutron star merger
The 21-cm line of hydrogen is strongly absorbed by interstellar dust
Indicate whether the statement is true or false
Thermodynamic Devices: A Carnot air conditioner has a coefficient of performance of 17.0 and removes 72.0 MJ of heat from the interior of a house every hour. How much power does it consume?
A. 1180 W B. 1320 W C. 520 kW D. 3.14 MW E. 1.25 MW
General Questions: A box is placed on a table which rests on the floor. The box pushes on the table; the reaction force to the box's push on the table is the table's push on the floor.
A. True B. False