Temperature variation of different parts of a person's body can be detected by analyzing the emission pattern of which type of electromagnetic radiation?
a. microwave
c. x-rays
b. infrared
d. ultraviolet
B
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Use the bond energies below to determine whether the following reaction is exothermic or endothermic:
H2+ CI2? 2 HCl H-H (bond energy: 436 kJ/mol) Cl-Cl (bond energy: 243 kJ/mol) H-Cl (bond energy: 431 kJ/mol) A) Exothermic with more than 50 kJ of energy released. B) Endothermic with more than 50 kJ of energy absorbed. C) Exothermic with less than 50 kJ of energy released. D) Endothermic with less than 50 kJ of energy absorbed.
The number of seconds in a 30 day month is
a. 
b. 
c. 
d. 
If y = 0.02 sin (30x? 400t) (SI units), the frequency of the wave is
A. 30 Hz. B. 15/? Hz. C. 200/? Hz. D. 400 Hz. E. 800? Hz.
Why do astronomers believe that the Jovian planets must contain rocky material in their cores?
A. Because the Jovian planets have large magnetic fields. B. Because silicates and irons were part of the overall composition of the Solar nebula. C. Because the Jovian planets have large gravity. D. The statement of the question is incorrect. Astronomers believe that the Jovian planets consist exclusively of hydrogen and helium.