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If a unit vector represented by 0.8hati-...

If a unit vector represented by `0.8hati-0.8hatj+chatk`, then the value of 'c' is :

A

1

B

`sqrt(0.11)`

C

`sqrt(0.01)`

D

`sqrt(0.39)`

Text Solution

Verified by Experts

The correct Answer is:
B
`1=sqrt((0.5)^(2)+(0.8)^(2)+C^(2))`
`C^(2)+.64+.25=1rArrC^(2)+0.89=1`
`rArrC=sqrt(0.11)`
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