How is low-level laser different from ordinary light?
What will be an ideal response?
? The low-level laser has coherence (unlike ordinary light with nonparallel waves, the laser waves are parallel and identical to each other).
? The low-level laser has monochromaticity (unlike ordinary light with many different wavelengths, the laser waves emit energy of a single wavelength).
? The low-level laser is collimated (unlike ordinary light that has wide divergence for illumination, the laser beam has minimal divergence).
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The cause of a drowning death is:
A) water in the lungs. B) water moving from the lungs into the blood. C) hypothermia. D) the deprivation of air exchange.
Which of the following exercises strengthens muscles through a contraction that overcomes some fixed resistance produced by equipment such as dumbbells, barbells, various weight machines, or exercise tubing and uses isotonic contractions in which force is generated while the muscle is changing in length?
A. Plyometric exercises B. Progressive resistance exercises C. Isometric exercises D. Circuit training exercises