Answer:
292.3254055 W/m²
469.26267 V/m
Explanation:
P = Power of bulb = 90 W
d = Diameter of bulb = 7 cm
r = Radius = 
= Permittivity of free space = 
c = Speed of light = 
The intensity is given by
5% of this energy goes to the visible light so the intensity is
The visible light intensity at the surface of the bulb is 292.3254055 W/m²
Energy density of the wave is
Energy density is also given by
The amplitude of the electric field at this surface is 469.26267 V/m
Amplitude of a magnetic field is given by
The amplitude of the magnetic field at this surface is
Answer:
A capacitor
Explanation:
Because it can store electric energy when disconnected from its charging circuit. Commonly used in electronic devices to maintain power supply while batteries change.
Hope this helps! :)
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Answer:
C - wasted output energy = useful output energy
Explanation:
Useful output + wasted output ALWAYS equals input energy. If the device is 50% efficient, that means that 50% of the input energy is converted into useful output energy, and 50% is converted to wasted output energy. The wasted output energy is equal to the useful output energy.
