About 500 stars can be seen by the naked eye from somewhere on Earth
Indicate whether the statement is true or false
FALSE
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When an atom is in a magnetic field, the electron energy levels remain unaltered because the atom is limited to a single wavelength
Indicate whether the statement is true or false
If a metal had a Fermi level of 5.0 eV, what would be the average energy of the electrons at 0 K?
A) 8.0 eV B) 6.0 eV C) 3.0 eV D) 0 E) 5.0 eV
A beam of light that is parallel to the principal axis strikes a concave mirror. What happens to the reflected beam of light?
A) It also is parallel to the principal axis. B) It is perpendicular to the principal axis. C) It passes through the center of curvature of the mirror. D) It passes through the focal point of the mirror. E) It passes between the focal point and the center of curvature of the mirror.
Torque: A flat circular coil has 200 identical loops of very thin wire. Each loop has an area of 0.12 m2 and carries 0.50 A of current. This coil is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop. What is the magnitude of the magnetic torque on the coil?
A. 0.25 N ? m B. 0.52 N ? m C. 2.5 N ? m D. 5.2 N ? m