In a large sampling of stars, the largest group represented in the H-R diagram will be the main sequence stars. Why are they so common?
What will be an ideal response?
Like the Sun, they are young enough to have most of their initial hydrogen still not fused into helium; they will not evolve off the main sequence until the helium builds up a lot. Since hydrogen is by far the most abundant element and the easiest to fuse, most stars are going to use it as their major fuel, as long as the supply lasts. Stars spend the vast majority of their life spans on the main sequence.
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A child is riding a merry-go-round which completes one revolution every 8.36 s. The child is standing 4.65 m from the center of the merry-go-round. What is the tangential speed of the child?
A) 5.64 m/s B) 3.49 m/s C) 0.556 m/s D) 1.75 m/s E) 1.80 m/s
The index of refraction of a type of glass is 1.50, and the index of refraction of water is 1.33. If light enters water from this glass, the angle of refraction will be
A) greater than the angle of incidence. B) equal to the angle of incidence. C) less than the angle of incidence.
Which of the following is the shell electron configuration for carbon?
a. 3, 3 b. 6 c. 2, 4 d. 1, 5
The average electric energy density of an electromagnetic wave is 0.600 × 10-7 J/m3. What is the electric field component of this wave?
A) 116 J/Cm B) 116 N/C C) 116 V/m D) All of the answers given are correct. E) None of the answers given is correct.