For a force to be a conservative force, when applied to a single test body
a. it must have the same value at all points in space. b. it must have the same direction at all points in space. c. it must be parallel to a displacement in any direction.
d. equal work must be done in equal displacements.
e. no net work must be done for motion in closed paths.
E
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The stars of the halo are all old, and those of the disk are all new
Indicate whether the statement is true or false
Gamma rays are emitted when high speed electrons decelerate as they are smashed into a metal target
a. True b. False Indicate whether the statement is true or false
To analyze single-slit diffraction, what new assumption not made in the Young double-slit experiment must be made?
1.Each portion of the slit acts as a source of light waves. 2.The light's wavelength is at the red end of the spectrum. 3.Interference effects can be ignored. 4.The distance between the slit and the screen is much greater than the wavelength of the light.
The half-life of carbon 14 is 5730 years. If a 1-gram sample of old carbon is 1/8 as radioactive as 1-gram of a current sample, then the age of the old sample is about
A) 716 years. B) 11,500 years. C) 17,200 years. D) 22,900 years. E) 46,000 years.