Captain Ray, on the Galactic Explorer, sets off bright signal lights at the two ends of his spaceship so that they are seen as flashing simultaneously by General Kay, who is watch the ship go by. General Kay concludes that she was next to the midpoint of the ship at the instant when the lights flashed in her reference frame. This can only happen if Captain Ray, at the center of the Galactic Explorer,
A. sees the lights flash simultaneously in his coordinate system.
B. sees the bow (front) light flash before the aft (rear) light.
C. sees the aft (rear) light flash before the bow(front light.
D. can calculate that the light flashes reach General Kay so that the flash from the bow light reaches her before the flash from the aft light.
E. can calculate that the light flashes reach General Kay so that the flash from the aft light reaches her before the flash from the bow light.
Answer: B
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Fill in the blank(s) with correct word
When a fast neutron collides with a hydrogen or deuterium nucleus, the most likely result is that
a. the neutron has an appreciable gain in kinetic energy, the gain being greatest for head-on collisions. b. the neutron has an appreciable gain in kinetic energy, the gain being greatest for oblique collisions. c. the neutron has an appreciable loss in kinetic energy, the loss being greatest for head-on collisions. d. the neutron has an appreciable loss in kinetic energy, the loss being greatest for oblique collisions. e. the neutron is absorbed by the hydrogen or deuterium nucleus.
Which of the following electron orbital transitions is not allowed?
(a) 3p to 3s (b) 4d to 3p (c) 5d to 4s (d) 5p to 4d
Radiation pressure: A radiometer has two square vanes (1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure. The center of each vane is 6.0 cm from the axis. One vane is silvered and it reflects all radiant energy incident upon it. The other vane is blackened and it absorbs all incident radiant energy. Radiant energy, having an intensity of 300 W/m2, is incident normally upon the vanes. What is the radiation pressure on the blackened vane? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) 
A. 1.0 × 10-10 Pa B. 1.0 × 10-9 Pa C. 1.0 × 10-8 Pa D. 1.0 × 10-7 Pa E. 1.0 × 10-6 Pa