Interstellar extinction and the reddening of light by the interstellar medium (ISM) are both caused by _____
a. atoms and molecules in the ISM
b. only atoms in the ISM
c. only molecules in the ISM
d. only dust in the ISM
e. dust, atoms and molecules of the ISM
d
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A traveling wave train has wavelength 1.0 m and speed 20 m/s. Find the wave frequency
a. 0.025 Hz c. 40 Hz b. 20 Hz d. 10 Hz
Which isotope of hydrogen is radioactive?
a. Protium b. Tritium c. Deuterium d. Hydronium
Consider the decay ?o ? ?- + e+. This decay is
A) forbidden because conservation of baryon number is violated. B) forbidden because conservation of lepton numbers is violated. C) allowed. D) forbidden because conservation of mass is violated. E) forbidden because conservation of energy is violated.
Magenta, yellow, and cyan are the colors used in ________ color mixing.
What will be an ideal response?