What happens to the magnitude of the magnetic field inside a long solenoid if the current is doubled?
1.It becomes four times larger.
2.It becomes twice as large.
3.It is unchanged.
4.It becomes one-half as large.
5.It becomes one-fourth as large.
2
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The ________ is determined by the distance that ________ can travel in a time span equal to the age of the Universe.
A. cosmological constant; neutrinos B. event horizon; light C. recession velocity; galaxies D. cosmic horizon; light
An object is placed 60 cm from a convex lens with a focal length of magnitude 10 cm. What is the magnification?
A) -0.10 B) 0.10 C) 0.15 D) 0.20 E) -0.20
Newton's modification of Kepler's Third law allows astronomers to determine the ________ of celestial objects.
A. period B. mass C. acceleration D. distance
Potential: A proton that is initially at rest is accelerated through an electric potential difference of magnitude 500 V. What speed does the proton gain? (e = 1.60 × 10-19 C , mproton = 1.67 × 10-27 kg)
A. 2.2 × 105 m/s B. 3.1 × 105 m/s C. 9.6 × 105 m/s D. 1.1 × 105 m/s