The lowest energy level of a hydrogen atom (n = 1) is called
a. the ground state.
b. the potential state.
c. the ionization state.
d. none of these.
[Ques. 2] What is the average power dissipation in a series RC circuit if R = 5.00 k, C = 2.00 F, and V = 170 cos (300t)?
a. 0.930 W
b. 2.60 W
c. 28.2 W
d. 157 W
e. 5.20 W
[Ques. 3] The color of a star reveals its
a. apparent brightness.
b. component elements.
c. density.
d. surface temperature.
[Ques. 4] The removal of an electron from an atom is called
a. binding affinity.
b. atomizing.
c. electron affinity.
d. ionization.
[Ques. 5] A current I = 3 sin (400 t) amperes flows in a series RL circuit in which L = 1 mH and R = 100. What is the average power loss?
a. 225 W
b. 450 W
c. 980 W
d. 1.12 kW
e. 900 W
[Ques. 6] The Sun has an apparent magnitude of about
a. minus 1.4.
b. minus 27.
c. 1.4.
d. 15.6.
[Ques. 7] In terms of energy levels of electrons, a potential well has
a. a negative value.
b. a positive or a negative value.
c. a positive value.
d. none of these.
[Ques. 8] An RLC series circuit has R = 100 ohms, C = 25 F, and L = 0.16 H. For what angular frequency of an ac voltage is the current flow maximum?
a. 251 rad/s
b. 500 rad/s
c. 757 rad/s
d. 884 rad/s
e. 79.6 rad/s
[Ques. 9] Taking the reciprocal of a star's parallax angle in arcsec gives the star's
a. energy output in joules.
b. absolute magnitude in watts.
c. solar constant in watts.
d. distance in parsecs.
[Ques. 10] When an electron in an atom is excited from a lower energy level to a higher one, a ______________ is ______________.
a. proton; absorbed
b. proton; emitted
c. photon; absorbed
d. photon; emitted
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