The center spot of Newton's rings is dark. This destructive interference occurs because:
a. the two beams travel distances that are different by half a wavelength.
b. both waves change phase by 180° as they are reflected.
c. one beam changes phase by 180° when it is reflected.
d. both waves have a trough.
c
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For the maximum induced emf in the coil of a generator, the term sin ?t has a value of zero
Indicate whether the statement is true or false
An 8000 kg satellite is launched from the surface of the earth, and injected into outer space a long distance from the earth. The initial velocity needed to launch the satellite into outer space is 
A. 8,450 m/s. B. 9,200 m/s. C. 11,180 m/s. D. 18,900 m/s. E. 25,200 m/s.
What is the momentum of a photon of light that has a frequency of 2.8 × 1014 Hz?
A) 1.5 × 10-28 kg?m/s B) 2.1 × 10-28 kg?m/s C) 4.4 × 10-28 kg?m/s D) 6.3 × 10-28 kg?m/s E) 6.2 × 10-28 kg?m/s
In essence, the nebular theory holds that ________
A) the planets each formed from the collapse of its own separate nebula B) our solar system formed from the collapse of an interstellar cloud of gas and dust C) nebulae are clouds of gas and dust in space D) The nebular theory is a discarded idea that imagined planets forming as a result of a near-collision between our Sun and another star.