Which method of astronomical measurement is the precise measurement of brightness?

A) spectroscopy
B) photography
C) astrometry
D) photometry
E) interferometry


D

Physics & Space Science

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Viewed from afar, the transit of Earth would cause the Sun's brightness to dim by approximately

A) 10%. B) 5%. C) 1%. D) 0.00001%. E) 0.01%.

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An iron robot falls from rest at a great height. Neglecting air resistance, what distance has it fallen in the first 3.5 seconds?

A. 49 m B. 60 m C. 98 m D. 31 m

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The top quark

a. is the only quark not yet detected experimentally b. has been shown not to exist c. was discovered at Fermilab d. none of the above

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Pre-main-sequence stars are above and to the right of the main sequence

a. True b. False Indicate whether the statement is true or false

Physics & Space Science