Active galaxies are the result of galactic _______________
Fill in the blank(s) with correct word
collisions
interactions
collision
interaction
merger
mergers
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Suppose that at a certain time a quanton has a well-defined wavelength of 0.15 nm. At that time, we perform an experiment to locate the quanton and get the result x = 0.45 nm to a high degree of precision. What can we say about the wavelength of the quanton’s wave function after the experiment?
A. It is still 0.15 nm. B. It is now 0.30 nm. C. It is now 0.45 nm. D. It is now not well-defined. E. Other (specify).
A 2.0-kg block of aluminum at 50°C is dropped into 5.0 kg of water at 20°C and the temperature is allowed to stabilize. What is the total change in entropy during this process, assuming no heat is exchanged with the environment?
The specific heat of aluminum is 910 J/(kg ? K) and the specific heat of water is 4190 J/(kg ? K). A) 8.2 J/K B) 10 J/K C) 3.3 × 10-2 J/K D) 3.8 × 10-3 J/K E) 2.4 × 10-3 J/K
Because of their short lifetimes, very few muons that are produced in the upper atmosphere at high speeds should be observed at the surface of the Earth. Yet we detect large numbers of muons at ground level because of
a. time dilation. b. length contraction. c. the equivalence of mass and energy. d. the principle of relativity. e. none of the above.
How much power does a sphere with a radius of 10 cm radiate into empty space if is has an emissivity of 1.0 and is kept at a temperature of 400 K? (? = 5.67 × 10-8 W/m2 ? K4)
A) 60 W B) 70 W C) 180 W D) 210 W E) 360 W