A spectrum that displays a smooth variation in intensity of all wavelengths without any breaks is a(n) ____ spectrum
a. absorption
b. emission
c. continuous
d. Doppler
e. ionization
c
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What can trigger the gravitational collapse of an interstellar gas cloud?
A) a decrease in temperature B) an increase in density C) a rise in temperature D) A and B E) A and C
In a mixture of hydrogen gas, oxygen gas, and nitrogen gas, the molecules with the greatest average speed are those of
A) hydrogen. B) oxygen. C) nitrogen. D) all the same
A charge of 50 nC is uniformly distributed along the y axis from y = 3.0 m to y = 5.0 m. What is the magnitude of the electric field at the origin?
A. 18 N/C B. 50 N/C C. 30 N/C D. 15 N/C E. 90 N/C
An object that appears green in empty space is placed near but not in a black hole. To an observer far from the black hole, the object would appear
A. red. B. black. C. green. D. blue. E. brown.