Part A \"How long does it take light to reach earth from the sun (through empty

Question

Part A "How long does it take light to reach earth from the sun (through empty space) if the distance between the earth and the sun is 1.49x10^8 km? dES= 1.49x10^8km"
Part b: "How many light waves of 550nm wavelength will fit into this distance" Part A "How long does it take light to reach earth from the sun (through empty space) if the distance between the earth and the sun is 1.49x10^8 km? dES= 1.49x10^8km"
Part b: "How many light waves of 550nm wavelength will fit into this distance"
Part b: "How many light waves of 550nm wavelength will fit into this distance"

Explanation / Answer

given,

distance = 1.49 * 10^8 km or 1.49 * 10^11 m

speed of light = 3 * 10^8 m/s

time = distance / speed

time = 1.49 * 10^11 / (3 * 10^8)

time = 496.66 sec

let n number of waves fit into this distance

so,

n * 550 * 10^-9 = 1.49 * 10^11

n = 2.709091 * 10^17 waves

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