One way in which the ionizing radiation occurring naturally in the environment has been beneficial to the human race is
A) the application of solar radiation to the treatment of cancer.
B) in the operation of the electron microscope.
C) in making nuclear fission possible.
D) in producing the mutations that are essential for the process of evolution.
E) nonsense--there are no beneficial uses of naturally-occurring high-energy radiation.
D
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Indicate whether the statement is true or false
If air speed is greater along the top surface of a bird's wings, pressure of the moving air there is
A) unaffected. B) less. C) more. D) turbulent.
How many photons per second emerge from a laser of power with wavelength (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 6.09 × 1015 photons/s B) 5.03 × 1012 photons/s C) 3.07 × 1015 photons/s D) 3.07 × 1013 photons/s
If an electromagnetic wave moves in the +y direction, and its magnetic field disturbance is in the +z direction, what polarization does this wave have? (Assume the z axis points upward.)
A. Upright polarization B. Horizontal polarization C. One cannot answer without more information.