A beam of light passes from air into water. Which isnecessarily true? a. the fre

Question

A beam of light passes from air into water. Which isnecessarily true? a. the frequency is unchanged and the wavelengthincreases. b. the frequency is unchanged and the wavelengthdecreases. c. the wavelength is unchanged adn the freqeuncydecreases. d. both the wavelength and the frequency increase. e. both the wavelength and the frequency decrease. I know the answer is (b) but I don't know why. I need anexplanation, or at least, an attempt at one as to why (b) is theright answer. A beam of light passes from air into water. Which isnecessarily true? a. the frequency is unchanged and the wavelengthincreases. b. the frequency is unchanged and the wavelengthdecreases. c. the wavelength is unchanged adn the freqeuncydecreases. d. both the wavelength and the frequency increase. e. both the wavelength and the frequency decrease. I know the answer is (b) but I don't know why. I need anexplanation, or at least, an attempt at one as to why (b) is theright answer.

Explanation / Answer

the frequency is unchanged and the wavelength decreases Because the frequency of the light doesnot change when itpasses from one medium to another. The speed of light in air is greater than in water we know wavelength = speed / frequency frequency is same .So, speed is directly proportional tospeed So, wavelength of the lightin air is greater than wavelengthin water

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