1.

The thickness of Milky way Galaxy is 40 Em. It can be expressed in metres as

Answer»

`4.0 xx 10^19 m`
`4.0 xx 10^15 m`
`4.0 xx 10^18 m`
`4.0 xx 10^12 m`

SOLUTION :`1Em = 10^18 m`
UNIT FACTOR , 1` = (10^18m)/(1Em)`
` 40Em = 40 Em xx ( (10^18m)/(1Em) ) `
`= 40 xx 10^18 m " or" 4.0 xx 10^19 m`


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