In a decay of 90Th232 by emission of an alpha particle, the daughter nucleus will be
A. 88Ra230.
B. 87Ac232.
C. 92U232.
D. 88Ra228.
E. 90Th228.
Answer: D
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A piece of uranium can be made into nuclear explosive only after it is purified into uranium-235, because
A. the other naturally occurring isotopes of uranium interfere with efficient chain reactions. B. uranium-235 is the heaviest isotope known to mankind. C. it has to be soldered with lead for safety. D. before purification, the uranium-235 nucleus will not split apart.
Of the following gases, which is the most important contributor to the Earth's greenhouse effect?
a. water vapor c. CFCs b. ozone d. methane
Tutankhamen's gold coffin weighs 250 pounds. What is the mass of the coffin in kilograms?
A) 110 kg B) 550 kg C) 130 kg D) 95 kg E) 11 kg
Resolution: The world's largest refracting telescope is operated at the Yerkes Observatory in Wisconsin. It has an objective lens of diameter of 1.02 m. Suppose such an instrument were mounted on a satellite at an elevation of 300 km above the ground and used to map surface details. If the telescope is forming images with light of wavelength 550 nm, what is the minimum separation of two objects on the ground whose separation could be clearly resolved by this lens?
Fill in the blank(s) with the appropriate word(s).