The answer for apex is ibn al-haytham.
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<em>Answer:</em>
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<em>The three major categories of energy for electricity generation are fossil fuels (coal, natural gas, and petroleum), nuclear energy, and renewable energy sources. Most electricity is generated with steam turbines using fossil fuels, nuclear, biomass, geothermal, and solar thermal energy.</em>
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Answer:
ratio = 744.68
Explanation:
Inductance of first inductor L₁ = 3.5 x 10⁻³ H
Inductance of second inductor L₂ = 4.7 x 10⁻⁶ H
Let current i is flowing in both of them . This current produces magnetic field in them due to which magnetic energy is stored in them . Magnetic energy of an inductor
= 1/2 L i²
where L is inductance and i is current flowing in it
Magnetic energy U₁ in first inductor
U₁ = 1/2 x3.5 x 10⁻³ x i²
Magnetic energy U₂ in second inductor
U₂ = 1/2 x4.7 x 10⁻⁶ x i²
U₁ / U₂ = (1/2 x3.5 x 10⁻³ x i²) / ( 1/2 x4.7 x 10⁻⁶ x i² 3.5 x 10³ / 4.7
= 744.68
The frequency of a wave becomes higher due to the object moving at a fast pace coming towards you with shorter wavelengths (depending on the speed) aka the Doppler Effect.
Hope this helps