In the M class stars, we find ________ absorption lines not seen in hotter stars
Fill in the blank(s) with correct word
molecular
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The annealing point for the soda-lime glass in Figure 9.3 is approximately _________K
Fill in the blank(s) with the appropriate word(s).
Which person’s watch (if any) measures the coordinate time ?t between those events in some inertial frame?
A. The rider in the merry-go-round B. The person standing on the ground C. Both D. Neither
The howler monkey is the loudest land animal and, under some circumstances, can be heard up to a distance of 8.9 km
Assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10-12 W/m2. A juvenile howler monkey has an acoustic output of What is the ratio of the acoustic intensity produced by the juvenile howler to the reference intensity I0, at a distance of 210 m? A) 110 B) 230 C) 76 D) 170 E) 300
A source emits sound at a fixed constant frequency f. If the source moves away from you, and at the same time you run away from the source, the frequency you hear is
a. the same as f c. lower than f b. higher than f d. unrelated to f