Violet light has a wavelength of approximately _______
a. 400 nm
b. 4000 nm
c. 7000 nm
d. 700 nm
e. 3×10^8 m
a
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The true distance of a nearby object can be calculated from the size of the apparent shift in its position relative to the background as seen from two viewing positions. That shift is called _____
A) occultation B) parallax C) focal ration D) collimation
Consider the star to which the arrow points. How is it currently generating energy?
A) by core hydrogen fusion B) by hydrogen shell burning around an inert helium core C) by gravitational contraction D) by core helium fusion combined with hydrogen shell burning E) by both hydrogen and helium shell burning around an inert carbon core
A boat sounds a fog horn on a day when both the sea water and the air temperature are 25.0° C. The speed of sound in sea water is 1 533 m/s. How much earlier (in s) does a dolphin 1 000 m from the source hear the sound than a person in a boat that is also 1 000 m distant? (Ignore the time it takes the sound to reach the water surface.)
a. 0.652 b. 2.12 c. 2.24 d. 2.77 e. 2.90
Describe the image formed by a convex lens when the object is closer to the lens than its focal length