Most of the visible light we see coming from the Sun originates from the
a. chromosphere.
b. photosphere.
c. corona.
d. sunspots.
e. magnetic field.
b
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We can see most of the galaxy with visible light
Indicate whether the statement is true or false
The battery powering a light bulb is disconnected. As the light bulb's heat dissipates, how will the resistance and current change?
1.The resistance will decrease and the current will increase. 2.The resistance will increase and the current will be zero. 3.The resistance will increase and the current will decrease. 4.The resistance will decrease and the current will be zero.
A charge, +Q, is placed inside a balloon and the balloon is inflated. As the radius of the balloon r increases the number of field lines going through the surface of the balloon:
a. increases proportional to r2. c. stays the same. b. increases proportional to r. d. decreases as 1/r.
Kinetic Energy: If an electron in the lab has a kinetic energy equal to twice its rest energy, what is its speed in the lab?
A. 0.84c B. 0.87c C. 0.89c D. 0.91c E. 0.94c