What is the hour angle of a star crossing your meridian?
A) -6 hours
B) 0 hours
C) 6 hours
D) It depends on your latitude.
E) It depends on the right ascension of the star.
B
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Uncertainty Principle Using Energy and Time: The excited state of a certain atom is 3.2 eV ± 0.21 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)(a) What is the average lifetime of this state, in femtoseconds?(b) If the excited energy were doubled (to 6.4 eV ± 0.21 eV), how would the lifetime be affected?
What will be an ideal response?
A series LC circuit contains a 100-mH inductor, a 36.0-mF capacitor and a 12-V battery. The period of the electromagnetic oscillations in the circuit is
a. 0.0227 s. b. 0.377 s. c. 2.26 s. d. 105 s. e. 1750 s.
Total Internal Reflection: Lucite has an index of refraction of 1.50. What is its critical angle if it is in air?
A. 1.16° B. 15° C. 41.8° D. 65.2° E. 87.4°
What prevents gravity from pulling you through the ground to the center of the Earth? Choose the best answer
1.They repel each other. 2.They attract each other. 3.They may attract or repel each other, depending on whether the charge on the insulator is positive or negative. 4.They exert no electrostatic force on each other. 5.The charged insulator always spontaneously discharges.