The path difference between two waves is 5 m. If the wavelength of the waves emitted by the two sources is 4 m, what is the phase difference (in degrees)?
a.
90
b.
400
c.
1.57
d.
7.85
e.
15
a
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The rms speed of a certain sample of carbon dioxide molecules, with a molecular weight of 44 g/mole is 396 m/s. What is the rms speed of water molecules, with a molecular weight of 18 g/mol at the same temperature?
A) 253 m/s B) 387 m/s C) 421 m/s D) 506 m/s E) 619 m/s
Which of the following are candidates for dark matter?
A) brown dwarfs B) Jupiter-size objects C) WIMPs D) faint red stars E) all of the above
You leave on a trip in order to attend a meeting that will start after you begin your trip. Along the way you plan to stop for dinner
If the fastest you can safely drive is 65 mi/h, what is the longest time you can spend over dinner and still arrive just in time for the meeting? A) 2.4 h B) 2.6 h C) 1.9 h D) You can't stop at all.
The self-inductance of a solenoid increases under which of the following conditions?
a. Only the solenoid length is increased. b. Only the cross sectional area is decreased. c. Only the number of coils per unit length is decreased. d. Only the number of coils is increased.