If one-third of the members of a symphony orchestra are absent because of head colds, thus reducing the overall intensity of sound by 33%, what will be the reduction in the decibel level?
a. 15 dB
b. 17 dB
c. 11 dB
d. 1.8 dB
e. 4.1 dB
d
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A ______________________ universe is Sun centered
Fill in the blank(s) with correct word
At t = 0 the switch S is closed with the capacitor uncharged. If C = 30 ?F, ? = 30 V, and R = 5.0 k?, at what rate is energy being stored in the capacitor when I = 2.0 mA?
A. 32 mW B. 40 mW C. 44 mW D. 36 mW E. 80 mW
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.
The disk component of our Galaxy has an overall relatively red color
Indicate whether the statement is true or false