The significant result of the Michelson-Morley experiment was that it found
a. the ether moved with the Sun.
b. the ether moved with the Earth.
c. the speed of the ether wind was greater than expected.
d. no effect.
d
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Unpolarized light of intensity 
is sent through 4 polarizers, each of the last three rotated 30
from the previous polarizer so that the last polarizer is perpendicular to the first. What is the intensity transmitted by this system?
A. 0.75 
B. 0.50
C. 0.42
D. 0.21
E. 0
A beam of orange light illuminates two slits that are closely spaced. The resulting intensity pattern is a series of bright and dark fringes. What happens to the intensity pattern if we now change to blue light?
A. The series of bright and dark fringes gets closer together B. The series of bright and dark fringes spreads out C. The series of bright and dark fringes changes to circular fringes D. The series of bright and dark fringes disappears E. Nothing changes
Which of the following best describes the current status of our understanding of the solar neutrino problem?
A) Experimental evidence indicates that the problem is solved and the expected number of solar neutrinos are indeed being produced by the Sun. B) The problem arose only because experimental data were being misinterpreted; on re-examination, the old data showed that the expected number of neutrinos were being detected. C) We have learned that the Sun's interior undergoes fusion at a lower rate than we had expected, and that is why we had observed fewer neutrinos than expected. D) The solar neutrino problem remains as perplexing as ever, and indeed makes everything we think we know about stars suspect.
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. The velocity acquired after starting from rest in m/s is
a. 0 d. 8 b. 2 e. 16 c. 4