Nuclear radiation can be detected by using a __________
Fill in the blank(s) with correct word
Geiger counter
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Phase Angles: A 60.0-?F capacitor is in series with a 100-? resistor connected across an ac source of frequency 120 Hz. What is the phase angle?
A. -12.5° B. +12.5° C. -77.6° D. +77.6° E. 90.0°
Star X has an apparent magnitude of 6, and star Y has an apparent magnitude of 2. How do they compare in observed brightness?
A) Star X appears brighter in the night sky than star Y. B) Star Y appears brighter in the night sky than star X. C) Star X is farther away from us than star Y. D) Star Y is farther away from us than star X.
The Milky Way is moving further away from most other galaxies in the universe
Indicate whether the statement is true or false
A person's eye lens is 2.7 cm away from the retina. What must the focal length of this lens be in order for an object placed at the near point (N = 25.0 cm) of the eye to focus on the retina?
A) -3.4 cm B) -2.4 cm C) 2.4 cm D) 3.4 cm E) 2.6 cm