Radioactive technetium, a gamma emitter, is taken up by the heart muscle in a medical test. The detector for the radiation emitted from the heart could be a
a. Tokamak.
b. quarter-wavelength antenna.
c. Geiger counter.
d. photoelectric tube.
e. diffraction grating.
c
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The oldest known elements in the periodic table are the ones with
A) the lowest atomic numbers. B) the highest atomic numbers. C) odd looking atomic symbols. D) atomic symbols that match their modern names.
Two bodies with masses m1 and m2 are both moving east with velocities of magnitudes v1 and v2, where v1 is less than v2. The magnitude of the velocity of the center of mass of this system of two bodies is
A. less than v1. B. equal to v1. C. equal to the average of v1 and v2. D. greater than v1 and less than v2. E. greater than v2.
The law of reflection, as well as the law of refraction, can be derived using Huygens' principle
Indicate whether the statement is true or false
Magenta, yellow, and cyan are the colors used in ________ color mixing.
What will be an ideal response?