A television remote control uses infrared light with a wavelength of 740nm. What is the frequency? (Speed of light= 3.0 x 108 m/s, 1 nm = 1 x 109m)
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The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.

Awave that is traveling fast can be said to have a high a. frequency b. speed c. wavelength d. amplitude e. period f. none of these

What is the frequency if a wave that pases a given pount 22 times in 2 seconds