1.

An electron with rest mass m_(0) moves with a speed of 0.8c.Its mass when it moves with this speed is…….

Answer»

`m_(0)`
`(m_(0))/(6)`
`(5m_(0))/(3)`
`(3m_(0))/(5)`

Solution :`m=(m_(0))/(SQRT(1-(v^(2))/(C^(2))))=(m_(0))/(sqrt(1-(0.8c)/(c)))^(2)`
`therefore m=(m_(0))/(sqrt(1-0.64))=(m_(0))/(sqrt(0.36))=(m_(0))/(0.6)=(10m_(0))/(6)`
`therefore m=(5m_(0))/(3)`


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