If you played music under water the wavelength of middle C would be
A) lengthened.
B) shortened.
C) unaffected.
D) none of the above
Answer: A
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A negatively charged particle is moving in the +x-direction when it enters a region with a uniform electric field pointing in the +x-direction. Which graph gives its position as a function of time correctly? (Its initial position is x = 0 at t = 0.)
a.
b.
c.
If the electric field is 12 V/m in the positive x-direction, what is the potential difference between the origin, (0, 0), and the point (3.0 m, 4.0 m)?
A) 48 V with the origin at the higher potential B) 48 V with the origin at the lower potential C) 36 V with the origin at the lower potential D) 36 V with the origin at the higher potential E) cannot be determined
Why doesn't the Moon have an atmosphere?
A. The blasts that formed the craters blew it away. B. The Moon's atmosphere was drawn away from it by Earth's stronger gravitational force. C. It had very few volcanoes and the gravity is too weak to hold a substantial atmosphere. D. The solar wind evaporated the Moon's atmosphere.
This image shows a colliding pair of galaxy clusters known together as the Bullet Cluster. The blue region represents a map of the cluster's dark matter. How was this blue map made?
A) The blue region was inferred from studies of how the cluster causes gravitational lensing of objects located behind it. B) The blue region represents X-ray emission from hot gas within the cluster. C) The blue region represents previously unknown radio emission from the dark matter. D) The blue region comes from the combined light of many young stars drawn together by the cluster's dark matter.