Gram formula mass means the <span> mass of one moles of the compound
so </span> The mass of 1.0 moles of this compound is <span>48g</span>
<span>so i conclude option 3 is correct
hope it helps</span>
Distance , d = a+b

The unit of d is in meter and t is in seconds.
So the unit of a a must be meter.
Now we have unit of b

is meter.
So unit of b*

= meter
Unit of b = meter/

So unit of a = m and unit of b = m/

.
Answer: 
Explanation:
Given
Power 
Distance from the light source 
Intensity is given by

Inserting values
