What particle is emitted when 20Na decays to 20Ne? (The atomic numbers of Na and Ne are, respectively, 11 and 10.)
a. beta (positron)
c. alpha
b. gamma quantum
d. beta (electron)
A
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Impedance: Which one of the following capacitances in series with a 100-? resistor and 15-mH coil will give a total impedance of 110 ? at 2.0 kHz?
A. 0.14 mF B. 46 ?F C. 10 ?F D. 0.56 ?F
The redshifts of Galaxy A and Galaxy B have been measured. The redshift of Galaxy B is twice that of Galaxy A. Which is moving away faster?
A. Galaxy A B. The two galaxies may be moving away at the same speed since their recessional velocity depends upon their distance. C. Galaxy B
Explain the operation of a constant-volume gas thermometer
What will be an ideal response?
Going from most significant to least significant, the atmospheric gases contributing to the greenhouse effect include
A) carbon dioxide and water vapor. B) carbon dioxide, water vapor, methane, nitrous oxides, and CFCs. C) water vapor and carbon dioxide. D) water vapor, CFCs, carbon dioxide, and ozone.