A light-year is a measurement of time
Indicate whether the statement is true or false
FALSE
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Two in-phase loudspeakers are 3.0 m apart. They emit sound with a frequency of 490 Hz
A microphone is placed half-way between the speakers and then moved along the line joining the two speakers until the first point of constructive interference is found. At what distance from that midpoint is that first point? The speed of sound in air is 343 m/s. A) 0.18 m B) 0.35 m C) 0.50 m D) 0.70 m E) There is no point in that line where constructive interference occurs.
If Earth's radius somehow increased with no change in mass, your weight would
A) increase also. B) decrease. C) stay the same.
Pre-main-sequence stars are above and to the right of the main sequence
a. True b. False Indicate whether the statement is true or false
Which type of nebula is produced when a star, hotter than 25,000 K, excites the gas near it to produce an emission spectrum producing a distinctive pink color?
a. emission nebulae b. H I c. reflection nebulae d. dark nebulae e. spectral type B6