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प्रश्न
A drop of water of radius 8 mm breaks into number of droplets each of radius 1 mm. How many droplets will be formed?
संख्यात्मक
उत्तर
Radius of a big drop (R) = 8 mm,
Radius of a small drop (r) = 1 mm.
Number of droplets (n) = `"Volume of big drop"/"Volume of each droplet"`
`=(4/3piR^3)/(4/3pir^3)`
`n = (R/r)^3=(8/1)^3`
n = 512
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