In the "Coral Model" of galactic colonization, if we assume that colonizing ships can travel at a few percent of the speed of light, then we might expect all of the habitable planets in the galaxy to be colonized within a few
A) tens of billions of years
B) billion of years
C) hundred thousand years
D) tens of millions of years
D
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In a blackbody, the __________ of the oscillating atoms is quantized
Fill in the blank(s) with correct word
Wind blowing over the cables of a bridge sheds alternating vortices resulting in oscillating forces acting on the cables. Which of the major parameters are the primary parameters which would be used in the description of this situation?
(A) Re and St (B) Fr and St (C) St and M (D) Re and M
Different colors correspond to electromagnetic waves of different
A) frequencies. B) speeds. C) amplitudes. D) weights. E) intensities.
A crying baby emits sound with an intensity of 8.0 × 10-8 W/m2. Calculate a reasonable estimate for the intensity level from a set of quintuplets (five babies),
all crying simultaneously at the same place? The lowest detectable intensity is 1.0 × 10-12 W/m2. A) 79 dB B) 69 dB C) 56 dB D) 49 dB E) 36 dB