Explain the difference between apparent visual brightness and absolute visual brightness
What will be an ideal response?
Apparent visual brightness is the perceived energy we see from the Earth without consideration of distance; whereas absolute visual brightness is the energy we receive if the star was at a distance of 10 parsecs.
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The Mississippi River has a huge delta. With each year and each episode of deposition, the river
A) lengthens its course and the delta shrinks. B) becomes choked and shortens as the delta grows. C) course lengthens and the delta grows. D) shortens as the delta moves upriver.
What is the origin of synchrotron radiation in radio galaxies?
A. neutron stars at the center of the radio galaxy B. supernova explosions C. radiation from a massive black hole at the center of the galaxy D. high-speed electrons spiraling around the magnetic field lines E. hydrogen gas
The four states of matter are solid, fluid, gas, and plasma
Indicate whether the statement is true or false
A metal rod of length 2.0 m is moved at 6.0 m/s in a direction perpendicular to its length. A 5.0 m T magnetic field is perpendicular to both the rod and its velocity. If the resistance of the rod is 15 m
what is the current in the rod?
A. 0.0 A B. 1.0 A C. 2.0 A D. 4.0 A E. 8.0 A