Uranium-235, uranium-238 and uranium-239 are different
A) elements.
B) ions of the same element.
C) isotopes of the same element.
D) none of the above
Answer: C
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A normal force
A. is any everyday force B. is the gravitational force C. acts perpendicular to the surface D. is always equal to the weight of an object.
What does a waning crescent moon mean?
a. The changing Moon between full moon and third quarter b. The changing Moon between third quarter and new moon c. The changing Moon between first quarter and full moon d. The changing Moon between new moon and first quarter e. The changing Moon between first and third quarters
A Compton scattering experiment is performed in which the scattered photons have a maximum energy of 17.2 keV. What was the incident energy of the photons used in this experiment?
A. 16.6 keV B. 18.5 keV C. 16.1 keV D. 17.8 keV
The Grand Tetons are examples of which type of mountain?
a. Fold b. Fault-block c. Volcanic d. None of these