You may have heard it said that all objects, even ones at the temperature of our bodies, are continually emitting electromagnetic radiation. Is this true?
A) Yes, and the radiation referred to results from the trace amounts of radioactive material that have accumulated in our bodies from the food we eat.
B) Yes, and the radiation from our bodies is mostly in the infrared region of the spectrum, and hence not detected by our eyes.
C) Yes, and this radiation is mostly in the form of radio waves, which is a common source of static often heard on an AM radio.
D) No, this is not true. If a person were emitting electromagnetic radiation, he could be seen glowing in the dark, and this is obviously not the case for most people.
B
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The greenhouse effect makes Earth warmer than it would be otherwise by about
A) 30 K. B) -16 K. C) 15 K. D) There is no greenhouse effect.
Discuss the advantages and disadvantages of use of herbicides to replace hand weeding
What will be an ideal response?
Theoretical physicists have had the greatest success in combining which force with the weak nuclear force?
a. gravitational force b. electromagnetic force c. strong nuclear force d. the force caused by the exchange of gluons
Uniform Circular Motion: Pulling out of a dive, the pilot of an airplane guides his plane into a vertical circle with a radius of 600 m. At the bottom of the dive, the speed of the airplane is 150 m/s. What is the apparent weight of the 70-kg pilot at that point?
A. 3300 N B. 690 N C. 2600 N D. 490 N E. 1400 N