X-ray radiation typically comes from
A) higher-energy electrons orbiting the nucleus in atoms.
B) electrons moving along a metal antenna.
C) thermal vibrations of molecules.
D) charged particles moving within the nucleus.
E) None of the above.
A
You might also like to view...
Which of the following is true of ancient constellations?
A) Out of all the ancient constellations, over 150 constellations are still in use. B) Ancient constellations were a grouping of bright and fainter stars. C) Ancient constellation boundaries, when they were defined at all, were only approximate. D) All the regions of the northern and southern sky were identified as constellations by ancient astronomers.
Why is falsifiability desirable in a scientific model?
What will be an ideal response?
Thin Lenses: An object is placed 15 cm to the left of a double-convex lens of focal length 20 cm. Where is the image of this object located?
A. 60 cm to the right of the lens B. 60 cm to the left of the lens C. 8.6 cm to the right of the lens D. 8.6 cm to the left of the lens E. 30 cm to the left of the lens
Why might increasing the temperature alter the rate of a chemical reaction?
A) The molecules will have a higher kinetic energy and bump into one another harder. B) The molecules are less reactive at higher temperatures. C) The molecules will more likely combine with other atoms at high temperature to save space. D) The density decreases as a function of temperature and this leads to an increase in volume which drops the rate of reaction. E) none of the above