What is the wavelength of the laser beam in the liquid
A helium-neon laser beam has a wavelength in air of 633 nm . It takes 1.38 ns for the light to travel through 30 cm of an unknown liquid. What is the wavelength of the laser beam in the liquid?
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You throw a ball upward with an initial speed of 4.6 {\rm m/s}. When it returns to your hand 0.94 {\rm s} later, it has the same speed in the downward direction (assuming air resistance can be ignored). What was the average acceleration vector of
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You want to photograph a circular diffraction pattern whose central maximum has a diameter of 1.2 cm. You have a helium-neon laser (landa= 633 nm) and a 0.13 mm-diameter pinhole. How far behind the pinhole should you place the viewing screen?
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