2.9×10^7 is the same as
a. 2.9 thousand.
b. 29 thousand.
c. 290 thousand.
d. 2.9 million.
e. 29 million.
e
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What is 56 + ( 32.00)/(1.2465 + 3.45 ) written with the correct number of significant figures?
A) 62.8 B) 62.812 C) 62.81 D) 63 E) 62.8123846
A soap bubble film (n=1.42 ) of thickness 106 nm results in a constructive interference in the reflected light if this film is illuminated by a beam of light with a wavelength of 601 nm
What are the next three thicknesses of this film that will also result in a constructive interference? A) 212 nm, 318 nm, 424 nm B) 53.0 nm, 35.3 nm, 26.5 nm C) 212 nm, 424 nm, 636 nm D) 67.0 nm, 42.4 nm, 22.3 nm E) 318 nm, 530 nm, 742 nm
The secondary rainbow is dimmer than the primary rainbow mainly because
A) its colors are inverted. B) it is larger, and its energy is spread over more area. C) it is farther from the viewer. D) it simply has less energy than the primary bow. E) of an extra reflection and refraction in the drops.
The oldest evidence of life on Earth dates back to about how many years ago?
a. 65 million b. 3.8 million c. 3500 million d. 570 million