At a particular point on a vertical soap film

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

At a particular point on a vertical soap film, an observer initially sees a bright green color (wavelength in air ≈520 nm\approx 520\,\text{nm}). As the film slowly drains and its thickness at that point decreases, which color is most likely to appear next? (a) Yellow (≈580 nm)(\approx 580\,\text{nm}) (b) Violet (≈400 nm)(\approx 400\,\text{nm}) (c) Blue (≈470 nm)(\approx 470\,\text{nm}) (d) Red (≈650 nm)(\approx 650\,\text{nm})

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