Photons associated with the magnetic field used in magnetic resonance imaging have considerably less energy than the photons used in CT scans
Indicate whether the statement is true or false
TRUE
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A fluorescent bulb emits what kind of spectrum?
A. absorption-line B. blueshifted C. continuous D. redshifted E. emission-line
Two wires support a post, with dimensions as shown in the figure. If d = 14 m, what is the value of x?
a.
7.5 m
b.
6.5 m
c.
18.3 m
d.
5.2 m
Angular Momentum: A uniform 135-g meter stick rotates about an axis perpendicular to the stick passing through its center with an angular speed of 3.50 rad/s. What is the magnitude of the angular momentum of the stick?
A. 0.0394 kg ? m2/s B. 0.473 kg ? m2/s C. 0.0739 kg ? m2/s D. 0.158 kg ? m2/s E. 0.0236 kg ? m2/s
What is a void?
A. a part of the sky that astronomers cannot observe due to bright emission from interstellar dust B. another name for a dark nebula C. a part of the sky where no galaxies are visible to us because of obscuring dust in the milky way D. a region in the universe where there are almost no galaxies