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What is the unit for measuring intensity...

What is the unit for measuring intensity of light?
a) Candela
b) Lightyear
c) Meter
d) Mol

Text Solution

Verified by Experts

Fro the free body diagram
`R_1=M_1gcostheta`..i
`R_2=M_2gcostheta`……ii
`T+M_1gsintheta-M_1a-mu R_1=0`……….iii
`T-M_2g+M_2a+muR=0`……..iv
From equation iii,
`T+M_1gsintheta-M_1a-costheta=0` …….iv
from equation iii,
`T-M_2gsintheta+muM_2gcostheta=0` .........v
From equation v
`g sin theta (M_1+M_2)=Mugcostheta(M_1+M_2)`
`-. a(M_1+M_2)=g sintheta (M_1+M_2)`
`-mug costheta (M_1+M_2)`
`gt a=g(sintheta-mucostheta)`
`:. The blcok (system) has acceleration
`=g(sintheta+mucostheta)`
The force exerted by the rod on one of the blocks is tension
`Tenson T=-M_1 sin theta+M_1a+mu M_1g cos theta`
`=M_1g sin theta+M_1(gsinmu-mugcostheta)+muM_1gcostheta=0`
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