Molecular Speeds: If the temperature of a gas is increased from 20°C to 100°C, by what factor does the rms speed of an ideal molecule change?
A. 1.1
B. 1.3
C. 2.2
D. 1.6
Answer: A
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If a beam of blue light has a wavelength of 400 nm is emitted by an object moving away from you at 1% of the speed of light, what wavelength would you see from this light?
A) 396 nm B) 399 nm C) 400 nm D) 401 nm E) 404 nm
A spaceship approaching an asteroid at a speed of 0.60c launches a scout rocket with speed 0.40c relative to the spaceship. At what speed is the scout rocket approaching the asteroid?
A) 0.81c B) 1.0c C) 0.76c D) 0.64c E) 0.96c
An electron, initially at rest, accelerates through a potential difference of 1 V, gaining kinetic energy KEe, while a proton, also initially at rest, accelerates through a potential difference of –1 V, gaining kinetic energy KEp, which of the following relationships holds?
1. KEe = KEp 2. KEe < KEp 3. KEe > KEp 4.The answer can’t be determined from the given information
In a star, the condition of balance between the inward force of gravity and the outward force of thermal and radiation pressure is known as _______________ equilibrium
a. hydrostatic b. thermal c. photostatic d. magnetostatic