The discoverer of radium was
A) Max Planck.
B) Enrico Fermi.
C) J. Robert Oppenheimer.
D) Marie Curie.
E) Lise Meitner.
D
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An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx = 0, what is the direction of the magnetic field?
a. negative y direction b. positive y direction c. negative z direction d. positive z direction e. negative x direction
The electrical conductivity of a metal is not proportional to which of the following?
(a) Free-electron density (b) Electron mobility (c) Electron charge (d) Atomic number
The force of attraction that a -40.0 ?C point charge exerts on a +108 ?C point charge has magnitude 4.00 N. How far apart are these two charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 2.10 m B) 3.67 m C) 3.12 m D) 2.49 m E) 1.13 m
Which of the following statements is true in the context of the formation of stars from the interstellar medium?
A) The densest interstellar clouds contain from 108-1011 atoms/cm3. B) The densest interstellar clouds have temperatures as low as 1000 K. C) Clouds can never resist their own gravity and eventually collapse under its influence to transform into stars. D) Stars can form in molecular clouds when the densest parts of the clouds become unstable and contract.