Calculate the frequency of visible light having a wavelength of 686 nm. (c = 3.00 × 108 m/s)

Given: Wavelength λ = 686 nm convert to meter λ = 6.86 x 10⁻⁷ m

Velocity of light c = 3.00 x 10⁸ m/s

Required: Frequency f = ?

Formula:   f = c/λ

                 f = (3.00 x 10⁸ m/s)/(6.86 x 10⁻⁷ m)

                 f = 4.37 x 10¹⁴ Hz or

                 f = 437 Terahertz 

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Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.