Answer:
Given that
D= 4 mm
K = 160 W/m-K
h=h = 220 W/m²-K
ηf = 0.65
We know that

For circular fin


m = 37.08


By solving above equation we get
L= 36.18 mm
The effectiveness for circular fin given as


ε = 23.52
One of your 5 senses because your 5senses are hearing, smelling, seeing, taste, touching
Our Earth budget is how much energy we receive from the sun.
So the best answer is A
I think it’s A not 100% sure
The answer is c, positron.