Light spreads out when it passes through a narrow slit because of
a. interference
b. diffraction
c. specular reflection
d. diffuse reflection
e. polarization
B
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The Earth's circumference was first determined by:
A) Aristotle using lunar eclipses. B) Pythagoras with geometry. C) Hipparchus with stellar parallaxes. D) Erastothenes with solstice shadows. E) Aristarchus with first and third quarter Moon timings.
Organisms designated as producers usually obtain their energy from:
a. other producers b. dead consumers c. decomposers d. the environment e. themselves
______ is another term for podcast.
A. radiocast B. audiocast C. webcast D. showcast
Which person’s watch or clocks register(s) the space time interval between those events?
A. Alice B. Bob C. Carol D. Alice and Bob E. Bob and Carol F. Alice and Carol T. All three observers