Surrounding every stationary electron is
A) a magnetic field.
B) an electric field.
C) both of these
D) neither of these
Answer: B
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The driving force of our planet's hydrologic cycle comes from
A) the balance between precipitation and evaporation. B) precipitation of water over the oceans. C) solar energy. D) wind.
Radiation Doses: The maximum permissible workday dose for occupational exposure to radiation is 11 mrem. A 77-kg laboratory technician absorbs 2.3 mJ of 0.5-MeV gamma rays in a work day. The relative biological effectiveness (RBE) for gamma rays is 1.00. What is the number of gamma-ray photons absorbed by the technician in a workday?
A. 3 × 1010 B. 3 × 109 C. 3 × 108 D. 1 × 109 E. 1 × 108
A transformer for charging a power tool steps the line voltage down to 2.9 V. The output current of this transformer is 240 mA. If the transformer is 80% efficient, what is the input current?
A) 300 mA B) 7.3 mA C) 240 mA D) 190 mA E) 4.6 mA
Radiative energy is
A) heat energy. B) energy from nuclear power plants. C) energy carried by light. D) energy of motion.