Martha is cycling at a speed of 20 kilometers per hour. how long will it take her to cover a distance of 60 kilometers? speed=distancetime

Adouble-slit experiment is performed with light of wavelength 600 nm. the bright interference fringes are spaced 1.8 mm apart on the viewing screen. what will the fringe spacing be if the light is changed to a wavelength of 400 nm? ?

Identify the type of synthetic material used in each object

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