In order to change power, what else must be changed?
2 answers:
Answer:
In order to change electrical power, current or voltage or both current and voltage should be changed.
for changing mechanical power, work or time or both should be change
Explanation:
Electrical power
We know that electrical power is given by following equation
therefore, power depends on current and voltage and to change power, current or voltage or both current and voltage should be changed
Mechanical power
also mechanical power is given as
Power=
therefore for changing mechanical power work and time should be change
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Answer:
The distance from the radio station is 0.28 light years away.
Solution:
As per the question:
Distance, d = 4 ly
Frequency of the radio station, f = 854 kHz =
Power, P = 50 kW =
Now,
From the relation:
P = nhf
where
n = no. of photons/second
h = Planck's constant
f = frequency
Now,
Area of the sphere, A =
Now,
Suppose the distance from the radio station be 'r' from where the intensity of the photon is
Now,
We know that:
1 ly =
Thus