The finding that electrons occupy discrete orbits in an atom was first explained by the
A) quantization of electric charge.
B) small mass of the electron.
C) circumference of each orbit being an integral multiple of an electron wavelength.
D) none of the above
Answer: C
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For relaxed viewing (microscope or telescope) the eyepiece is adjusted to place the image at
A) the near point. B) the focal point. C) the pupil of the eye. D) infinity. E) the radius of curvature.
A 10-kg block is pushed across a friction-free horizontal surface with a horizontal force of 20 N. The acceleration of the block is
A) 1 m/s2. B) 2 m/s2. C) 5 m/s2. D) 10 m/s2. E) none of the above
A tuning fork with a frequency of 512 Hz is used to tune a violin. When played together, beats are heard with a frequency of 4 Hz. The string on the violin is tightened and when played again, the beats have a frequency of 2 Hz. The original frequency of the violin was
A. 510 Hz. B. 514 Hz. C. 516 Hz. D. 508 Hz.
A body in a room at 300 K is heated to 3,000 K. The wavelength of the most intense EM radiation emitted by the body at 3,000 K is 10 times the wavelength of the most intense EM radiation at 300 K
Indicate whether the statement is true or false