How various lines per centimeter does a grating have if the, Ask an Expert

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Q. How many lines per centimeter does a grating have if the third-order occurs at a 23.0 degree angle for 630-nm light?

Q. A small circular hole 6.00 in diameter is cut in the side of a large water tank, 22.0 below the water level in the tank. The top of the tank is open to the air. what is the speed at which the water shoots out the tank?

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