A 30.0 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the frequency of the second mode?
A. 900 Hz
B. 827 Hz
C. 750 Hz
D. 721 Hz
E. 650 Hz
B. 827 Hz
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Why do scientists think the Cassini spacecraft did not observe "spokes" on the rings during the first year of its visit with Saturn?
A) The "spokes" observed before were a phenomenon of the Voyager 2 camera. B) The "spokes" are not a regular phenomenon of Saturn's rings. They occur only in certain seasons. C) The "spokes" are related to Saturn's magnetic field and the Cassini spacecraft was located inside Saturn's magnetic field, while Voyager 2 was not. D) The Cassini spacecraft was not looking in the right part of Saturn's ring system to see the "spokes". E) To see the "spokes," a particular alignment of the rings with the Sun is necessary and it took one year for that alignment to reoccur.
Why is the cause of the acceleration of the universe called "dark energy"?
A) Dark energy and dark matter are just two forms of the same thing. B) The term dark energy was the one that caught on with other astronomers. C) We're pretty sure that whatever is causing the acceleration is pure evil.
Sound waves can interfere with one another so that no sound is heard
A) True B) False
The continuous circulation of Earth's water is known as the
a. hydrologic cycle. b. aqua cycle. c. redistribution cycle. d. hydrogeologic cycle.