Describe the measurements needed to determine the orbit of a visual binary star
What will be an ideal response?
Measure the positions of the two stars over the course of many years to map the orbits, then determine the orbital period.
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Standing Waves on a String: A guitar-like stringed instrument has a string that is 16 cm long. It sounds the musical note A (440 Hz) when played without fingering. By what distance should you shorten it to play the note C (523 Hz)?
A. 2.5 cm B. 1.7 cm C. 3.4 cm D. 4.2 cm
An AM station is broadcasting at 980 kHz, while an FM station up the road is assigned 98 MHz. How do their carrier waves compare?
What will be an ideal response?
Harlow Shapley concluded that the Sun was not in the center of the Milky Way Galaxy by
A) looking at the shape of the "milky band" across the sky. B) mapping the distribution of stars in the galaxy. C) mapping the distribution of globular clusters in the galaxy. D) mapping the distribution of gas clouds in the spiral arms. E) looking at other nearby spiral galaxies.
If the activity of a sample of 232Th decreases from 1000 cpm to 500 cpm in 60 min, in another 60 min its activity will be
a. 500 cpm. b. 0 cpm. c. 250 cpm. d. 125 cpm.