Which of the following best describes why the Sun emits most of its energy in the form of visible light?
A) Like all objects, the Sun emits thermal radiation with a spectrum that depends on its temperature, and the Sun's surface temperature is just right for emitting mostly visible light.
B) Nuclear fusion in the Sun's core produces visible light photons.
C) The visible light comes from energy level transitions as electrons in the Sun's hydrogen atoms jump between level 1 and level 2.
D) The Sun's gas is on fire like flames from wood or coal, and these flames emit visible light.
A) Like all objects, the Sun emits thermal radiation with a spectrum that depends on its temperature, and the Sun's surface temperature is just right for emitting mostly visible light.
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An ant crawls in a straight line at a constant speed of 0.35 m/s, beginning in the corner of a square classroom that is 5.00 m on a side. It first crosses the diagonal of the room, and then turns to the right, continuing at 0.45 m/s to the far corner of the same wall from which it began. What was the ant’s average speed for the whole trip?
A. 0.40 m/s B. 0.16 m/s C. 0.24 m/s D. 0.39 m/s
A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J.He slides part way down the hill to a point where his gravitational potential energy is 200 J. His kinetic energy at that point will be
a. 200 J. b. 300 J. c. some unknown value between 0 and 500 J. d. none of the above.
Voltage is the force on a charged object divided by the charge on the object
a. True b. False Indicate whether the statement is true or false
An alpha particle has a mass of 6.64 × 10-27 kg and a charge of 3.20 × 10-19 C, and it is traveling at 0.9650c
(c = 3.00 × 108 m/s), 1 eV = 1.60 × 10-19 J) (a) What is its rest energy (in GeV)? (b) What is its total energy (in GeV)? (c) What is its kinetic energy (in GeV)?