1.

The r.m.s. value of electric field of the light coming from sun in 720 N // C. The average energy density of e.m.f. is :

Answer»

`3.3 xx 10^(-3) J // m^(3)`
`4.58 xx 10^(-6) J // m^(3)`
`6.37 xx 10^(-9) J // m^(3)`
`81.35 xx 10^(-12) J // m^(3)`

SOLUTION :In E.m waves, electric ENERGY density
= magnetic energy density.
`:. "Total energy density"=2 xx "electric energy"`
`=2((1)/(2) epsilon_(0)E^(2))`
`=2 xx (1)/(2) xx 8.854 xx 10^(-12) xx 720^(2)`
`= 4.58 xx 10^(-6) J // m^(3)`


Discussion

No Comment Found

Related InterviewSolutions