In an MRI medical imaging apparatus, the patient is subject to what kind of "radiation"?
A) gamma rays
B) X-rays
C) radio
D) alpha radiation
E) beta rays
C
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Terminal Voltage and Internal Resistance: A battery has an emf ? = 78.0 V and an internal resistance r = 4.0 ?, as shown in the figure. A current of 4.7 A is drawn from the battery when a resistor R is connected across the terminals a and b. The power dissipated by the resistor R is closest to
A. 280 W. B. 340 W. C. 320 W. D. 300 W. E. 370 W.
The relative ages of igneous rocks can be determined using which of the following? Choose ALL of the correct answers.
A. cross-cutting relationships B. contact metamorphic zones C. inclusions D. the Principle of Original Horizontality
The biological damage caused by radioactive materials is due to
A) nuclear fusion occurring within biological cells. B) thermal energy created by radioactive decay within biological cells. C) nuclear fission occurring within biological cells. D) the fast-moving daughter nuclei [or residual nuclei] passing through biological cells. E) the fast-moving alpha, beta, and gamma particles passing through biological cells.
A beam of white light in air passes through the transparent object shown. Dispersion is observed to occur. From the diagram we can tell that
A. the object behaves as a concave mirror. B. the object acts as a converging lens. C. the index of refraction is larger for blue light than red. D. the index of refraction is larger for red light than blue.