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If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

What is the relationship between the direction of motion of the balloon and the wind currents