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10 Question-Answer on Doppler Effect in light 1.        A star is emitting yellow light. If it is accelerated towards earth, then to an observer on earth, it will appear (a)     Shining yellow (b)    Gradually changing to violet (c)     Gradually changing to red (d)    Unchanged Ans: (b) 2.        When a source of light is receding away from an observer, then the spectral lines will get displaced towards (a)     Violet region (b)    Red region (c)     Ultraviolet region (d)    Blue region Ans: (b) 3.        Radio waves are sent from radar towards an aero plane and these waves again reach the radar after reflection from aero plane. If the aero plane is moving towards radar, then the wavelength of reflected wave: (a)     Increased (b)    Decreased ...