About what percentage of Hubble Deep Field (HDF) galaxies do astronomers find are irregular?
A: 5%.
B: 25%.
C: 50%.
D: 70%.
E: 90%.
Ans: D: 70%.
Physics & Space Science
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An electron follows a circular path (radius = 15 cm) in a uniform magnetic field (magnitude = 3.0 G). What is the period of this motion?
a. 0.12 ?s b. 1.2 ms c. 0.18 ?s d. 1.8 ms e. 1.8 ?s
Physics & Space Science
Consider the interference colors in a film of gasoline on a wet street. The water provides a
A) means of spreading the gasoline into a thin film. B) means of slowing the rapid evaporation of gasoline. C) chemical bond with the gasoline. D) second reflecting surface. E) all of the above
Physics & Space Science
The energy of the photon depends on its ________
Fill in the blank(s) with correct word
Physics & Space Science
The specific heat at constant volume per mole of 3R/2 is for what type of molecule?
a. monatomic b. diatomic c. polyatomic d. any type
Physics & Space Science