What is the frequency of the most intense radiation from an object with temperature 100°C? The constant in Wien's law is 0.0029 m ? K. (c = 3.0 × 108 m/s)
A) 2.9 × 10-5 Hz
B) 3.9 × 1013 Hz
C) 1.0 × 1013 Hz
D) 1.0 × 1011 Hz
B
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Coulomb's Law: Four point charges of equal magnitudes but with varying signs are arranged on three of the corners and at the center of the square of side d as shown in the figure. Which one of the arrows shown represents the net force acting on the center charge?
A. A B. B C. C D. D
How many photons per second emerge from a laser of power 2.00 mW with wavelength 605 nm? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 6.09 × 1015 photons/s B) 5.03 × 1012 photons/s C) 3.07 × 1015 photons/s D) 3.07 × 1013 photons/s
A _____ is a commonly accepted set of scientific ideas and assumptions
A) deferent B) paradigm C) theory D) hypothesis
In absolute visual magnitude, Mv, the subscript V refers to the:
A) apparent magnitude of a star observed from Earth. B) wavelengths of light your eye can see. C) distance between the sources of light. D) luminosity of a star observed from Earth.