When light having vibrations with angular frequency ranging from 2.7 x10^{15};{

Question

When light having vibrations with angular frequency ranging from 2.7 x10^{15};{ rad/s} to4.7 x 10^{15};{ rad/s}strikes the retina of the eye, it stimulates the receptor cells there and is perceived as visible light. What are the limits of the frequency of this light? Ultra sound.High-frequency sound waves (ultrasound) are used to probe the interior of the body, much as x rays do. To detect a small objects such as tumors, a frequency of around 4.90 { MHz} is used. What are the period and angular frequency of the molecular vibrations caused by this pulse of sound?

Explanation / Answer

= 2 f      f= / (2 ) f = 2.7 * 10E15 / (2 ) = 4.30 * 10E14 /sec         and = 3 * 10E8 / 4.3 * 10E14 = 700 m f = 4.7 * 10E15 / (2 ) = 7.48 * 10E14 /sec        and =  3 * 10E8 / 7.48 * 10E14 = 401 m Similarily f = 4.9 * 10E6    = 3.08 * 10E7 P = 1 / f = 1 / 4.9 * 10E6 = 2.04 * 10E-7 sec

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