An organ pipe open at both ends has two successive harmonics with frequencies of 210 Hz and 240 Hz. What is the length of the pipe? The speed of sound is 344 m/s in air
A) 3.62 m B) 4.90 m C) 5.25 m D) 2.76 m E) 5.73 m
E
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Describe two ways in which an atom can be excited
What will be an ideal response?
Suppose we imagine the Sun to be about the size of a grapefruit. Which of the following describes the size and distance of Earth on the same scale?
A) Earth is the size of a tip of a ballpoint pen about 1 meter away from the Sun. B) Earth is the size of a golf ball about 1 meter away from the Sun. C) Earth is the size of a tip of a ballpoint pen about 15 meters away from the Sun. D) Earth is the size of a golf ball about 15 meters away from the Sun. E) Earth is the size of a marble about 25 miles away from the Sun.
Briefly summarize current knowledge about the term Np in the equation Number of Civilizations = Np × flife × fcivilization × fnow
What will be an ideal response?
The difference between a DC and an AC generator is that
a. the DC generator has one unbroken slip ring. b. the AC generator has one unbroken slip ring. c. the DC generator has one slip ring split in two halves. d. the AC generator has one slip ring split in two halves. e. the DC generator has two unbroken slip rings.