Survey Monkey and Doodle are examples of websites you can use to create ______.
A. 3D objects
B. polls and surveys
C. animated GIFs
D. video
Answer: B
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Venus may have been more Earth-like in the past because
A) it was rotating more rapidly B) the Sun was dimmer, putting out less solar radiation C) it was not as close to the Sun D) its atmosphere was thinner
In terms of thermal expansion it is important that
A) a key and its lock are made of similar or the same material. B) the fillings in your teeth expand at the same rate as teeth. C) iron rods and concrete in which they're embedded expand equally. D) all of the above E) none of the above
Light of wavelength 500 nm illuminates a soap film ( n = 1.33 ). What is the minimum thickness of film that will give an interference when the light is incident normally on it?
A) 24 nm B) 56 nm C) 94 nm D) 188 nm E) 376 nm
Huygen's principle states that
1.there is a secondary rainbow with the spectral colors reversed from the primary rainbow. 2.light has properties of both waves and particles. 3.all points on a wave front can be taken as point sources of secondary spherical wavelets which construct the new position of the wave front as time passes. 4.rainbows are a result of dispersion.