A star moving away from earth shows?
Correct answer: B. Red shift
- A. Green shift
- B. Red shift
- C. Blue shift
- D. None of these options is correct
Explanation
When a star emits light, the color of its light as observed on earth depends on its motion relative to earth. If a star is moving towards the earth then its light is shifted to higher frequencies on the color spectrum (towards the gamma-ray end of the spectrum). This shift towards higher frequency is called a "blue shift". The faster a star moves towards the earth, the more its light is shifted to higher frequencies. In contrast, if a star is moving away from the earth, its light is shifted to lower frequencies on the color spectrum (towards the orange/red/infrared/microwave/radio end of the spectrum). A lower frequency shift is called a "redshift". The faster a star moves away from the earth, the more its light is shifted to lower-frequency colors. This effect is known as the "Doppler shift".
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About Alternating Current
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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