The dilemma known as the ultraviolet catastrophe was resolved in 1900 by
a. Bohr.
b. Rutherford.
c. Einstein.
d. Planck.
[Ques. 2] A circuit contains two inductors of 6.0 mH inductance in parallel placed in series with an inductor of 8.0 mH inductance. After one of the 6.0 mH inductors burns out, the repairman wants to replace all three inductors with one inductor of equivalent inductance. Assuming inductors combine in series and parallel the same way resistors do, what inductance should he use?
a. 3.0 mH
b. 3.4 mH
c. 4.8 mH
d. 11 mH
e. 20 mH
[Ques. 3] Stars in the process of forming are called
a. giant planets.
b. brown dwarfs.
c. red supergiants.
d. protostars.
[Ques. 4] The planetary model of the atom is associated with
a. Bohr.
b. Thomson.
c. Dalton.
d. Rutherford.
[Ques. 5] When a switch is closed, completing an LR series circuit, the time needed for the current to reach three-quarters its maximum value is ____ time constants.
a. 0.500
b. 0.693
c. 0.725
d. 1.33
e. 1.39
[Ques. 6] What type of nebula is the Horsehead?
a. Primitive
b. Bright emission
c. Bright reflection
d. Dark
[Ques. 7] The unit called the hertz (Hz) is equivalent to
a. 1/s only.
b. a reciprocal second only.
c. s-1 only.
d. all of these.
[Ques. 8] When a switch is closed, completing an LR series circuit, the time needed for the current to reach one half its maximum value is ____ time constants.
a. 0.250
b. 0.500
c. 0.693
d. 1.00
e. 1.44
[Ques. 9] The two major types of nebulae are
a. emission nebulae and dark nebulae.
b. bright nebulae and dark nebulae.
c. bright nebulae and reflection nebulae.
d. reflection nebulae and emission nebulae.
[Ques. 10] Doubling the wavelength of a photon would ______________.
a. reduce its energy to one-half
b. double its energy
c. triple its energy
d. not change
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