How can we best observe the Sun's chromosphere and corona?
A) The chromosphere is best observed with infrared telescopes and the corona is best observed with ultraviolet telescopes.
B) The chromosphere is best observed with ultraviolet telescopes and the corona is best observed with X-ray telescopes.
C) The chromosphere and corona are both best studied with radio telescopes.
D) The chromosphere and corona are both best studied with visible light.
B
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What strain(s) can be measured by diffraction techniques?
(a) Elastic and plastic (b) Plastic (c) Elastic (d) Viscous
A 100-g sample of a certain substance undergoes a transformation of some kind that releases 20,000 J of energy. What kind of transformation is this likely to be?
A. A temperature change B. A phase change C. A chemical reaction D. A nuclear reaction E. It is impossible to guess.
Since the rest energy of an electron and its antiparticle a positron is 0.511 MeV, a gamma ray must have an energy larger than 1.022 MeV to produce an electron-positron pair
a. True b. False Indicate whether the statement is true or false
A tow truck exerts a force of 3000 N on a car, which then accelerates at 2 m/s2. What is the mass of the car?
A) 500 kg B) 1000 kg C) 1500 kg D) 3000 kg E) none of these