At a distance of 10 km from a radio transmitter, the amplitude of the E field is 0.20 volts/meter. What is the total power emitted by the radio transmitter?
A. 10 kW
B. 67 kW
C. 140 kW
D. 245 kW
E. 21 kW
Answer: B
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The Doppler effect is characteristic of
A) water waves. B) sound waves. C) light waves. D) all of the above E) none of the above
Two metal spheres are made of the same material and have the same diameter, but one is solid and the other is hollow. If their temperature is increased by the same amount,
A) the solid sphere becomes denser and the hollow one less dense. B) the two spheres remain of equal size. C) the solid sphere becomes less dense and the hollow one denser. D) the solid sphere becomes bigger than the hollow one. E) the hollow sphere becomes bigger than the solid one.
Which type of weather is characterized by spiral storms with winds of up to 300 km/hour?
A) hurricanes B) tornadoes C) tropical depressions D) tropical storms
In the process of crystallization, the remaining magma becomes _______.
Fill in the blank(s) with correct word