Using K = 3/2 kT, what is the average kinetic energy of a He atom at:
(a) 10. K?
(b) -196.°C?
(c) 100.°C?
(a) 2.1 × 10-22 J = 1.3 meV
(b) 1.59 × 10-21 J = 0.0099 eV
(c) 7.72 × 10-21 J = 0.0482 eV
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A piano wire of length 1.5 m vibrates so that one-half wavelength is contained on the string. If the frequency of vibration is 65 Hz, the amplitude of vibration is 3.0 mm, and the density is 15 g/m, how much energy is transmitted per second down the wire?
a. 21 W b. 11 W c. 5.4 W d. 2.2 W e. 1.1 W
A red dwarf can use all of its hydrogen to prolong its life on the main sequence of a Hertzsprung-Russell diagram
Indicate whether the statement is true or false
An AC series circuit contains a resistor of 20.0 ?, an inductor of 74.0 mH and a variable capacitor. If the frequency of the applied voltage is 423 Hz, to what setting should the capacitor be set if resonance is achieved?
a. 1.89E–5 F b. 7.66E–6 F c. 5.09E–6 F d. 1.91E–6 F e. 1.91E–5 F
The focal point of a lens is determined by
A. both shape and index of refraction. B. only the shape if you have a negative lens, otherwise only the index of refraction. C. the index of refraction of the lens material. D. the shape of the two surfaces of the lens.