"Buckyball" is an allotrope of the element
a. carbon.
b. oxygen.
c. phosphorus.
d. none of these.
a
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A velocity selector uses a fixed electric field of magnitude E and the magnetic field is varied to select particles of various energies. If a magnetic field of magnitude B is used to select a particle of a certain energy and mass, what magnitude of magnetic field is needed to select a particle of equal mass but twice the energy?
a. 0.50 B b. 1.4 B c. 2.0 B d. 0.71 B e. 1.7 B
State the physical characteristics of the three types of radiation from radioactive sources
In an LCR series circuit with XL > XC, the phase angle between the current and voltage phasors is 30°. If the AC frequency doubles, what is the magnitude of the resulting phase angle?
a. 30° b. less than 30° c. more than 30° d. Additional information is needed to reach a determination.
After a supernova explosion, the remains of the stellar core ________
A) will always be a neutron star B) may be either a neutron star or a black hole C) will always be a black hole D) may be either a white dwarf, neutron star, or black hole