The intensity at a distance of 6.0 m from a source is 6 × 10-10 W/m2
(a) What is the power level emitted by the source?
(b) What is the intensity level in dB?
(a) 2.7 × 10-7 W/m2
(b) 28 dB
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What aspect of Kepler's theory would have horrified all astronomers before Kepler?
A) Kepler's elliptical orbits. B) The fact that the Earth has a spherical shape in Kepler's theory. C) Kepler's simple circular orbits. D) The fact that Earth was no longer at the center. E) The absence of any epicycles [or "circles-within-circles"].
In a single-slit diffraction experiment, the central maximum is broadened if the wavelength of light is increased
Indicate whether the statement is true or false
Halving the focal length of a telephoto lens, while holding aperture size constant, will change the light intensity admitted to the film by what factor?
a. 0.50 c. 0.25 b. 2.0 d. 4.0
Which of the following is not normally a component of a fission reactor?