Electrons are used to produce X-rays by allowing a beam of electrons to strike a heavy metal surface. When the speeds of the electrons in the beam is increased, this results in:
A. X-rays being produced having higher energies
B. X-rays having longer wavelengths being produced
C. Faster X-rays being produced
D. More X-rays being produced per unit time
A. X-rays being produced having higher energies
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Matter Waves: A person of mass 50 kg has a de Broglie wavelength of 4.4 × 10-36 m while jogging. How fast is she running? (h = 6.626 × 10-34 J ? s)
A. 2.0 m/s B. 3.0 m/s C. 4.0 m/s D. 5.0 m/s
A torque of 12 N ? m is applied to a solid, uniform disk of radius 0.50 m, causing the disk to accelerate at 5.7 rad/s2. What is the mass of the disk?
A) 17 kg B) 13 kg C) 8.5 kg D) 4.3 kg
A bar magnet is attached solidly to a frictionless surface and its length is aligned with the x axis. To the right of the first magnet a short distance away is a second bar magnet with its center placed on the x axis and its length perpendicular to the x axis. The second magnet is free to move. Once placed in position at rest, which best describes the initial motion of the second magnet?
a. The magnet will move away from the fixed magnet. b. The magnet will not move. c. The magnet will move toward the fixed magnet. d. The magnet will start to rotate.
At what two celestial locations do the celestial equator and ecliptic coincide?
a. winter solstice and summer solstice b. vernal equinox and autumnal equinox c. they coincide at all points because they are the same. d. north celestial pole and south celestial pole e. zenith and east point