Which of the following statements is true?
A) an atom is the smallest particle known to exist
B) there are only about 100 different kinds of atoms that combine to form all substances
C) there are thousands of different kinds of atoms that account for a wide variety of substances
D) a large atom can be photographed with the aid of an ordinary microscope
E) none of the above
Answer: B
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X-rays with an energy of 400 keV undergo Compton scattering from a target. The scattered rays are deflected at an angle of 38° relative to the direction of the incident rays.What is the energy of the scattered x-rays?
a. 343 keV b. 300 keV c. 400 keV d. 2410 keV
An electromagnetic wave with components Ey = Eo sin(kx - ?t) and Bz = Bo sin(kx - ?t) is a wave with a frequency of
A) k. B) ?/2?. C) k/?. D) ?. E) ?/?.
The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III
?
The object’s acceleration is zero in region(s)
a.
I.
b.
II.
c.
III.
d.
no regions
Spherical Mirrors: The focal length of a concave mirror has a magnitude of 20 cm. What is its radius of curvature?
A. 10 cm B. 40 cm C. -40 cm D. 20 cm E. -20 cm