In a double-slit interference experiment, a wave from one slit arrives at a point on a screen one wavelength behind the wave from the other slit. What is observed at that point?
a. dark fringe
b. bright fringe
c. multicolored fringe
d. gray fringe, neither dark nor bright
Ans: b. bright fringe
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What is the most important reason why an icy moon is more likely to be geologically active than a rocky moon of the same size?
A) Ice is less rigid and has a lower melting point than rock. B) Ice is colder than rock. C) Ice contains more radioactive elements than rock. D) Ice is affected by tidal forces to a greater extent than rock. E) Ice is less dense than rock.
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up and down motion The velocity points down
Indicate whether the statement is true or false
Due to inertia, perhaps a railroad train in motion should continue moving indefinitely when its engine is turned off. This is not observed because railroad trains
A) aren't massive enough. B) are too heavy. C) ride on straight tracks. D) encounter opposing forces.
Ansel places an object 30 cm from a thin, convex lens along the axis. If a real image forms at a distance of 15 cm from the lens, what is the focal length of the lens?
a. 15 cm c. 7.5 cm b. 10 cm d. 30 cm