One consequence of Einstein's theory of special relativity is that
A) absolute Earth velocity can be measured.
B) absolute velocity of stars can be measured with respect to the ether wind.
C) simultaneity is not absolute.
D) relative speed can not be measured.
E) nothing is conserved because it changes.
C
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If the work function of a metal surface is 2.20 eV, what frequency of incident light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A) 2.50 × 1014 Hz B) 3.53 × 1014 Hz C) 5.92 × 1014 Hz D) 2.05 × 1014 Hz E) 1.02 × 1014 Hz
FM radio reception may be blocked by buildings because the wavelengths are too short to be ______________ around buildings
Fill in the blank(s) with correct word
Microfossils found in northwestern Australia in 2011 appear to have been
A) photoheterotrophs B) chemoheterotrophs C) photoautotrophs D) chemoautotrophs
The diameter of a typical star (the Sun) is approximately ____ times larger than the diameter of a typical planet (the Earth)
a. 10 b. 100 c. 1000 d. 10,000 e. 100,000