Light from the sun takes 43 minutes to reach Jupiter. The sun is almost 430 time

Question

Light from the sun takes 43 minutes to reach Jupiter. The sun is almost 430 times farther from Jupiter than is Callisto (one of the moons of Jupiter). How long does light from Callisto take to reach Jupiter?

A star with an ancient Arabic name is which of the following?

invisible to the eye

Based on how stars are named, which star is probably dimmest?

Ursae Majoris

If one star is 38 times the flux ratio of another star, how many magnitudes brighter is it?

48 minutes 6 seconds 48 hours 6 minutes 0.6 seconds

A star with an ancient Arabic name is which of the following?

was not known to the ancients a relatively bright star relatively dim

invisible to the eye

Based on how stars are named, which star is probably dimmest?

Telescopium Ursae Majoris Orionis

Ursae Majoris

If one star is 38 times the flux ratio of another star, how many magnitudes brighter is it?

3.95 2.5 418 38 39.5 O

Explanation / Answer

1) the sun is 430 times more farther to jupiter tha its moon

so the speed of light is 3x10^8 m/s

and the distance is 430/43=10 times the distance between moon and jupiter.

so (3x2)x10^8/10x(1000/3600)

=0.6 second to reach

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2) a star with ancient arabic name is a relatively bright star. as from the fact that most of the star names were given in the arabic and greek language and which was accepted. since than they gave name to the star according to the quality and significance of that star.

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3) according to the name given to the star it is clear from the fact that orionis is probabbly dimmest star. as the word meaning is that hunter in dark and it is a dwarf case of celestial bodies now.

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4) it can be given by the formula

brightness=2.5[log(38)]

=3.95

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