Use the Inverse square law, Intensity (I) of a light is inversely proportional to the square of the distance(d).
I=1/(d*d)
Let Intensity for lamp 1 is L1 distance be D1 so on, L2 D2 for Intensity for lamp 2 and its distance.
L1/L2=(D2*D2)/(D1*D1)
L1/15=(200*200)/(400*400)
L1=15*0.25
L1=3.75 <span>candela</span>
An area where the particles in a medium are spaced close together is called compression.
Primary Waves
Secondary go only through air, but not water.
Answer:
They are Transverse Waves.
The first step is the fusion of hydrogen into Deuterium.
