The velocity of a satellite or a star is determined by the change in frequency of signal (radio wave or light) they emit this phenomena is called _:
Correct answer: B. Doppler's shift
- A. Shift theorem
- B. Doppler's shift
- C. Polarization
- D. None of these
Explanation
The Doppler's effect, also known as Doppler shift, explains the change in frequency of waves emitted by a moving source, which is crucial in determining the velocity of stars or satellites. This change in frequency allows scientists to calculate the speed of these celestial objects based on the observed shift in their emitted signals. Options A, C, and D are incorrect as they do not accurately describe the phenomenon of frequency change in signals for velocity determination.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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