If the position of an electron (m = 9.11 × 10^-31 kg) could be measured to within 10-30 m, the uncertainty in the magnitude of its speed could be as much as
a. 6 × 10^-34 m/s.
b. 6 × 10^25 m/s.
c. 6 × 10^30 m/s.
d. 1031 m/s.
e. 1061 m/s.
B
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Will our Sun ever undergo a white dwarf supernova explosion? Why or why not?
A) no, because it is not orbited by another star B) yes, right at the end of its double shell-fusion stage of life C) yes, about a million years after it becomes a white dwarf D) no, because the Sun's core will never be hot enough to fuse carbon and other heavier elements into iron
The resulting atomic number of an element that emits 1 alpha particle, 1 positron, and 3 beta particles is
A) decreased by 2. B) decreased by 1. C) unchanged. D) increased by 1. E) increased by 2.
A flat square coil of wire measures 9.5 cm on each side and contains 175 turns of very thin wire. It carries a current of 6.3 A in a uniform 0.84-T magnetic field
What angle less than 90° should the plane of this coil make with the magnetic field direction so that the magnitude of the magnetic torque on it is 6.5 N ? m?
In an X-ray tube, high-speed electrons are slammed into a lead target, giving off X-rays. If the electrons are accelerated from rest through a potential difference of 100,000 volts, what speed do they have when they strike the target? (qe = 1.6 × 10^-19 C, me = 9.11 × 10^-31 kg, and c = 3.00 × 10^8 m/s)
a. 0.17c c. 0.91c b. 0.41c d. 0.55c