The speed of the electron in the Bohr theory of hydrogen is
a. proportional to n.
b. proportional to n2.
c. inversely proportional to n.
d. inversely proportional to n2.
c
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A physical pendulum is composed of a disc whose center of gravity is attached to a thin rod. The disc has a moment of inertia of 1?2 MR2. The mass of the disc is 500 gm and has a radius of 4.00 cm. The length of the rod is 50.0 cm. The period of the physical pendulum is
A. 1.24 sec. B. 1.42 sec. C. 1.74 sec. D. 1.90 sec. E. 2.25 sec.
How many special rays are used in ray tracing to find the image of a lens?
A. 2 B. 3 C. 4 D. 5
A(n) ____________________ is the largest known structure in the universe
Fill in the blank(s) with correct word
A ball rolls across a floor with an acceleration of 0.100 m/s2 in a direction opposite to its velocity. The ball has a velocity of 4.00 m/s after rolling a distance 6.00 m across the floor. What was the initial speed of the ball?
A) 4.15 m/s B) 5.85 m/s C) 4.60 m/s D) 5.21 m/s E) 3.85 m/s