Energy Levels: A hydrogen atom is excited to the n = 11 level. Its decay to the n = 7 level is detected in a photographic plate. What is the wavelength of the light photographed? (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 7510 nm
B. 4670 nm
C. 12,400 nm
D. 4380 nm
Answer: A
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What is the net power that a person with surface area of 1.20 m2 radiates if his emissivity is 0.895, his skin temperature is 27°C, and he is in a room that is at a temperature of 17°C? (? = 5.67 × 10-8 W/m2 ? K4)
A) 60.3 W B) 62.6 W C) 65.7 W D) 68.4 W E) 64.8 W
The typical mountain valley that has been subjected to glaciation is shaped like
A) a semi-circle. B) the letter "U." C) one half of a square. D) the letter "V."
Who, in 1925, postulated that matter, as well as light, has properties of both waves and particles?
a. Planck b. Heisenberg c. de Broglie d. Einstein
Comparing the electrostatic force and the gravitational force we can say that
A. both have the same dependence on distance, the electrostatic force can be either attractive or repulsive while the gravitational force is only attractive, and the electrostatic force is stronger. B. the electrostatic force falls off more rapidly with distance, the electrostatic force can be either attractive or repulsive while gravitation is only attractive, and the electrostatic force is stronger. C. both have the same dependence on distance, both involve attraction and repulsion, but the gravitational force is stronger. D. both have the same dependence on distance, the electrostatic force can be either attractive or repulsive while the gravitational force is only repulsive, and the electrostatic force is weaker. E. both have the same dependence on distance, both involve attraction and repulsion, but the electrostatic force is stronger.