Gamma rays are photons with very high energy. How many visible-light photons with a wavelength of 500 nm would you need to match the energy of a gamma-ray photon with energy 4.1 × 10-13? (h = 6.626 × 10-34 J • s, c = 3.00 × 108 m/s)
A) 1.0 × 106
B) 1.4 × 108
C) 6.2 × 109
D) 3.9 × 103
A
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Io experiences strong internal tidal heating because of
A) large amounts of radioactive decay occurring inside the moon B) the large amount of internal heat left over from its formation C) the strong tidal forces exerted by the outer Galilean moons, Europa, Ganymede, and Callisto D) the strong tidal force from the massive Jupiter combined with its elliptical orbit which causes the strength and direction of the force to constantly change
What do we mean by the orbital energy of an orbiting object (such as a planet, moon, or satellite)?
A) Orbital energy is the sum of the object's kinetic energy and its gravitational potential energy as it moves through its orbit. B) Orbital energy is the object's kinetic energy as it moves through its orbit. C) Orbital energy is a measure of the object's speed as it moves through its orbit. D) Orbital energy is the amount of energy required for the object to leave orbit and escape into space.
A circuit contains two inductors of 6.0-mH inductance in parallel placed in series with an inductor of 8.0-mH inductance. After one of the 6.0-mH inductors burns out, the repairman wants to replace all three inductors with one inductor of equivalent inductance. Assuming inductors combine in series and parallel the same way resistors do, what inductance should he use?
a. 3.0 mH b. 3.4 mH c. 4.8 mH d. 11 mH e. 20 mH
What is the source of acid rain?
A) Acid rain is from dissolved carbon dioxide. B) All rain is acid rain because rain has a pH is less than 7. C) Rain is normally basic, but depending on the weather it can get slightly acidic. D) All rain is acid rain because rain has a hydronium ion concentration greater than 10-7 M. E) none of the above