What was Einstein's main reason for proposing the principle of the constancy of lightspeed?
A) This principle followed from his conclusions regarding the relativity of time and space.
B) His own observations of such simple phenomena as reflection and refraction convinced him that light must have the same speed for all observers.
C) The Michelson-Morley experiment showed that every observer observes the same speed for any lightbeam.
D) He believed that Maxwell's theory of electromagnetism should obey the principle of relativity.
E) He believed that conservation of energy should be obeyed in every nonaccelerated reference frame.
D
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The transverse nature of electromagnetic waves is apparent because
A) they are electric in nature. B) they are magnetic in nature. C) they can be polarized. D) they are electromagnetic in nature. E) None of the previous answers is correct.
Gamma rays can penetrate
A) air only. B) a piece of paper. C) several millimeters of aluminum. D) several centimeters of lead. E) several meters of iron.
What is the maximum velocity of a photoelectron emitted from a surface with work function 5.22 eV when illuminated by 200-nm ultraviolet light? (melectron = 9.11 × 10^-31 kg, h = 6.63 × 10^-34 J×s, 1 eV = 1.60 × 10^-19 J, and 1 nm = 10-9 m)
a. 800,000 m/s c. 653,000 m/s b. 212,000 m/s d. 591,000 m/s
When we analyze whether a world is a possible home to life, the key thing we look for is
A) the past or present existence of liquid water. B) evidence of atmospheric oxygen. C) the presence of organic molecules such as amino acids. D) surface coloration changes that could indicate vegetative growth.