An atom has completely filled inner shells and a single valence electron in an excited p state. The filled inner shells have an orbital momentum equal to zero. A magnetic field is applied, defining the z-axis along the field
Which of the following sets of angles are possible angles between the magnetic field and the orbital angular momentum?
A) 45°
B) 90°
C) 45°, 90°
D) 45°, 135°
E) 45°, 90°, 135°
Answer: E
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Spherical Mirrors: An object that is 3.4 mm tall is placed 25 cm from the vertex of a convex spherical mirror. The radius of curvature of the mirror has magnitude 73 cm.(a) How far is the image from the vertex of the mirror?(b) What is the height of the image?
Fill in the blank(s) with the appropriate word(s).
A fully charged capacitor (37. ?F) is discharged through a resistor (1000. ohms). If the voltage reduced to 7.6 volts after just 20. ms, what was the original potential on the capacitor?
A) 16. volts B) 9.0 volts C) 8.0 volts D) 13. volts E) 11. volts
Talk-radio station KOOK is at approximately 90 megahertz on the radio dial. This means that KOOK broadcasts
A) an electromagnetic wave whose frequency is 90 vibrations/second. B) an electromagnetic wave whose frequency is 90 × 106 vibrations/second. C) an electromagnetic wave whose wavelength is 90 × 106 vibrations per second. D) a sound wave whose frequency is 90 × 106 vibrations/second. E) a sound wave whose frequency is 90 vibrations/second.
Fireworks go off at the same time according to Earth clocks in two cities, Alum and Boron, that are 300 km apart. The people in a spaceship that is flying in a straight line from Alum to Boron at 0.80c also observe the fireworks. Do they see the fireworks in the two cities simultaneously? If the people in the spaceship say the fireworks were not simultaneous in Alum and Boron, how long before or
after the fireworks flashed at Alum did the fireworks flash at Boron according to their calculations? (The spaceship is directly over Alum when the fireworks flash.) a. Yes; 0 b. Before; 1.0 × 10^?3 s c. After; 1.0 × 10^?3 s d. Before; 1.3 × 10^?3 s e. After; 1.3 × 10^?3 s