There are no radio telescopes in space because:
A) no one has built an antenna large enough to reach astronomical objects yet.
B) radio telescopes are too fragile and expensive to make to put into space.
C) there is too much radio noise in space, so a radio telescope won't work out there.
D) radio waves penetrate Earth's atmosphere so there is no need to put one in space.
E) you need an array, like the VLA, to detect ANY radio radiation, so it is just not realistic to put an entire array in space.
D
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An object is placed at a distance of 41.4 cm from a thin lens along the axis. If a real image forms at a distance of 36.1 cm from the lens, on the opposite side from the object, what is the focal length of the lens?
a. 19.3 cm b. 38.8 cm c. 10.6 cm d. 282 cm e. 6.21 cm
Does red light have higher or lower frequency than blue light? Does red light have longer or shorter wavelengths than blue light?
What will be an ideal response?
In an X-ray diffraction experiment using X-rays of ? = 0.500 × 10?10 m, a first-order maximum occurred at 5.00°. Find the crystal plane spacing.
A. 2.87 × 10?10 m B. 1.36 × 10?10 m C. 6.24 × 10?9 m D. 1.93 × 10?9 m E. 5.74 × 10?9 m
Mass on a Spring: An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its elastic potential energy is a maximum?
A. at either A or B B. midway between A and B C. one-third of the way between A and B D. one-fourth of the way between A and B E. at none of these points