A sound source of frequency 1000 Hz moves at 40.0 m/s toward a listener who is at rest. What is the apparent frequency heard by the listener? (speed of sound = 340 m/s)
a. 853 Hz
c. 1130 Hz
b. 872 Hz
d. 1170 Hz
C
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How far away is most distant galaxy seen in the Hubble Deep Field?
A: About twelve billion (1.2x1010) light years. B: About eighteen thousand Hubble Distance Units. C: About forty megaparsecs. D: About sixty million (6x107) astronomical units. E: About two hundred billion (2x1011) light years.
Which of the following quantities is equal to the time constant for a charging capacitor?
a) the time it takes a capacitor to reach 33% of its maximum charge b) the time it takes a capacitor to reach 50% of its maximum charge c) the time it takes a capacitor to reach 66% of its maximum charge d) the time it takes a capacitor to reach 75% of its maximum charge e) the time it takes a capacitor to reach its maximum charge
Detailed study of stellar spectra in 1897, which enabled the development of the H-R diagram, was performed by:
A) E.C. Pickering. B) Harlow Shapley. C) James Lick. D) John Herschel. E) Antonia Maury.
Is it possible to have a zero electric field value between a negative and positive charge along the line joining the two charges?
A) Yes, if the two charges are equal in magnitude. B) Yes, regardless of the magnitude of the two charges. C) No, a zero electric field cannot exist between the two charges. D) cannot be determined without knowing the separation between the two charges E) cannot be determined without knowing the magnitude of the charges