How can the color index give the star's temperature?
What will be an ideal response?
Color index requires observing the star's brightnesses (magnitudes) through blue and visual filters. By taking the difference between these two magnitudes, the color index is calculated. The color index depends directly on the temperature of the star; the brighter it is in the blue image, the hotter it is.
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If a red giant appears the same brightness as a red main sequence star, which one isfurther away?
a) the red giant b) we can't tell c) it depends on the phase of the Moon d) the main sequence star e) they are at the same distance
When light travels from a larger index of refraction towards a smaller index of refraction, there is no phase change upon reflection at the boundary
Indicate whether the statement is true or false
Two charged particles repel each other with a force F. If the charge of both particles is tripled and the distance between them is also tripled, then the force will be
A) F. B) 2 F. C) F/2. D) F/4. E) none of the above
For a given steel, there is a crack of length a in the steel, and the yield strength of the steel is increased by heat treatment. The fracture strength of this steel is _________.
Fill in the blank(s) with the appropriate word(s).