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Science - Physics

Consider the following statements:
1. Light of longer wavelength is scattered much more than the light of            shorter wavelength.
2. The speed of visible light in water is 0.95 times the speed in vacuum.
3. Radio waves are produced by rapidly oscillating electrical currents.
4. To detect the overspeeding vehicles, police use the Doppler effect of             reflected short radio waves.
Which of these statements are correct ? 


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