Some elements like iron, cobalt, and holmium make very good natural magnets. Which of the following statements best describes why?
a.
Hund's rules state for atoms with less than filled subshells, the spin and orbital angular momentum should be maximized (in that order). This means that the magnetic dipoles of the atoms in solid iron, cobalt, and holmium can align and add to form large total magnetic moments. The key to these atoms is the large number of unpaired spins.
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A very thin horizontal, 2.00-m long, 5.00-kg uniform beam that lies along the east-west direction is acted on by two forces. At the east end of the beam, a 200-N force pushes downward. At the west end of the beam, a 200-N force pushes upward
What is the angular acceleration of the beam? A) 240 rad/s2 north B) 1.33 × 102 rad/s2 north C) zero D) 240 rad/s2 south E) 1.33 × 102 rad/s2 south
A monochromatic light beam is incident on a barium target, which has a work function of 2.6 eV. If a stopping potential of 1.2 V is required, what is the light beam photon energy?
a. 2.6 eV b. 1.4 eV c. 1.2 eV d. 3.8 eV e. 0.7
Alpha particles, each having a charge of +2e and a mass of 6.64 × 10-27 kg, are accelerated in a uniform 0.80-T magnetic field to a final orbit radius of 0.30 m. The field is perpendicular to the velocity of the particles
How long does it take an alpha particle to make one complete circle in the final orbit? (e = 1.60 × 10-19 C) A) 0.15 ?s B) 0.25 ?s C) 0.33 ?s D) 0.40 ?s E) 0.49 ?s
A double convex lens has a focal length of 0.10 m. An object 0.05 m high is placed 0.15 m from the lens surface on the principal axis. Sketch a ray diagram and give the characteristics of the image