Bright lines in an emission spectrum represent:
A) regions from which light travels more rapidly and reaches us more quickly
B) flaws in the telescopes and spectroscopes that astronomers use to measure spectra
C) photons absorbed when an electron jumps from a lower to a higher energy level
D) particular energies of light that are emitted from a distant object
E) photons absorbed when an electron jumps from a higher to a lower energy
Ans: D) particular energies of light that are emitted from a distant object
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The source of electrons in an ordinary electric circuit is
A) a dry cell, wet cell, or battery. B) usually a wall socket. C) a generator at the power station. D) the electric conductor itself. E) none of the above
A 500-Hz whistle is moved toward a listener at a speed of 10.0 m/s. At the same time, the listener moves at a speed of 20.0 m/s in a direction toward the whistle. What is the apparent frequency heard by the listener? (The speed of sound is 340 m/s.)
a. 473 Hz c. 533 Hz b. 485 Hz d. 545 Hz
Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
a. 2.0 mT b. 10 mT c. 8.0 mT d. 1.6 mT e. 7.2 mT
A shock wave is
A) the opposite of a bow wave. B) usually composed of a pair of closely spaced cones. C) weak for aircraft that fly at less than the speed of sound. D) all of the above E) none of the above