Two people are standing in the middle of a frozen pond that is frictionless. They want to move to the edges of the pond but are
1 answer:
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Answer:
Wavelength of radio is wave is 3 m
Explanation:
Wavelength of radio is wave is
where
wavelength is
Answer:
(a)
(b) P = 0.816 Watt
Explanation:
(a)
The power radiated from a black body is given by Stefan Boltzman Law:
where,
P = Energy Radiated per Second = ?
σ = stefan boltzman constant = 5.67 x 10⁻⁸ W/m².K⁴
T = Absolute Temperature
So the ratio of power at 250 K to the power at 2000 K is given as:
(b)
Now, for 90% radiator blackbody at 2000 K:
<u>P = 0.816 Watt</u>