A pulsar requires that a neutron star I. rotate rapidly. II. have a radius of at least 10 km. III. have a strong magnetic field. IV. rotate on an axis that is different from the axis of the magnetic field
a. I & III
b. I & IV
c. II, III, & IV
d. I, III, & IV
e. I, II, III, & IV
D
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The stars found in nebulae like the Orion Nebula probably formed:
A) a few million years ago. B) about 10 million years ago. C) hundreds of millions of years ago. D) billions of years ago. E) at the beginning of the universe.
The faintest visible stars to the naked eye have an apparent magnitude of about 6
Indicate whether the statement is true or false
An outcome of universal gravitation is that
A) planets aren't cubes with sharp corners. B) its discovery prompted other laws of nature. C) it provided prediction and discovery of planets. D) all of the above
How many times greater is the speed of red light (? = 700 nm) than the speed of violet light (? = 400 nm) in a vacuum?
a. 1.75 , the first color of light is faster b. 0.57 , the second color of light is faster c. 3.00 × 10^8 , the first color of light is faster d. 1.00 , both colors of light have the same speed e. 3.00 × 10^8 , the second color of light is faster