When the principal quantum number of the
hydrogen electron is infinite,
a) the electron has an orbit of 0.053 nm radius.
b) the electron has a binding energy of +13.60 eV.
c) the electron has a binding energy of -13.60 eV.
d) the electron is no longer bound to the hydrogen
nucleus at all.
d
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What does CCD stand for?
A. cosmic-ray channel detector B. charge collecting device C. channel-coupled detector D. charge-coupled device
An aluminum bar (E 5 70 GPa, v 5 0.33) of diameter 20 mm is stretched by axial forces P, causing its diameter to decrease by 0.022 mm. The load P is approximately:
(A) 73 kN
(B) 100 kN
(C) 140 kN
(D) 339 kNP
A softer landing occurs when an falling object bounces from a surface
A) in a extended time. B) quickly. C) either of these D) neither of these
The current in a coil with a self-inductance of 1.5 mH increases from 0 to 2.0 A in a tenth of a second. What is the induced emf in the coil?
a. 15 mV c. 0.10 V b. 0.30 V d. 30 mV