The greenhouse effect occurs on Earth because carbon dioxide is
a. transparent to visible light and opaque to infrared radiation.
b. opaque to visible light and transparent to infrared radiation.
c. totally opaque to both visible light and infrared radiation.
d. totally opaque to both visible light and infrared radiation.
a
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Nine bulk silicon carbide specimens of the same size were tested and the following strengths were obtained: 22, 26, 33, 50, 29, 56, 58, 41, and 43 MPa.
(a) Plot these data to evaluate the characteristic strength and the Weibull modulus. (b) What is the stress for a 90 % probability of survival for this material?
Galileo's observation of sunspots showed that ________.
A. planets moved along elliptical orbits around the Sun B. the Sun was not a flawless sphere C. the stars could change D. Earth revolved around the Sun E. None of these choices is correct.
A nucleus undergoes radioactive decay, emitting a gamma ray. Which of the following statements is true?
A. A nuclear proton changes into an electron-positron pair. B. Both daughter and parent nuclei have the same atomic number. C. The daughter nucleus is more massive than the parent. D. The daughter nucleus has more neutrons than the parent.
If a hydrocarbon is not aliphatic, it is ______________
Fill in the blank(s) with correct word