Radio telescopes are generally ________ than visible-light telescopes.
A) much larger
B) much smaller
C) much more expensive
D) located at much higher altitudes
A) much larger
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Why are rapid fluctuations in an active galaxy's luminosity evidence for a supermassive black hole?
What will be an ideal response?
In the first step of the p-p fusion chain, two ____________ are combined to make a heavy hydrogen nucleus, also known as a _____________. Byproducts of the reaction are _____________ and ______________
Fill in the blank(s) with correct word
A spherical, non-conducting shell of inner radius r1= 10 cm and outer radius r2 = 15 cm carries a total charge Q = 15 ?C distributed uniformly throughout the volume of the shell
What is the magnitude of the electric field at a distance r = 12 cm from the center of the shell? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) 5.75 × 103 N/C B) zero C) 2.87 × 106 N/C D) 5.75 × 106 N/C E) 2.87 × 103 N/C
The "average speed" of a trip by car describes:
a. the speed on the odometer at a given moment. b. a speed that remains the same throughout the whole trip. c. the distance traveled divided by how long it took. d. how long the trip usually takes. e. the speed at which most people drive for the trip.