http://physics.ncat.edu/~242/Block08Notes.pdf (Use this link for Notes about the

Question

http://physics.ncat.edu/~242/Block08Notes.pdf (Use this link for Notes about the equations used)

Please Answer 2, 3, 4, and 5! Answer more than one questions please.....

BLOCK 8 DRILL SET, FALL 17 NAMELed Nelson PHYSICS 242 to me in Slide this drill set under Ma teena 30% dor any time before 7:50 AM Friday Oct ber 20, or give it Marteena 312 by 8:00 AM that day. Each 1. Find the electric field amplitade of a linearly-polarized visible light em wave of intensity 555 MWIm2 moving a speed of 1.240 x 108 m's through diamond (a noamagnetic dielectric) (Remember to replace the metric prefixes with their EQUATION USED (ONE=SIGN) powery of 10 when needed inoblmson all dril sets.) ANSWER 2. Calculate the dielectric constant of diamond for the light of Problem I above. EQUATION USED (ONE = SIGN) SOLUTION ANSWER dicular to a perfectly absorbing surface exerts a radiation 3. A linearly ressure of 678 Pa on that surface. Find the intensity of that em wave. EQUATION USED (ONE = SIGN) em wave moving in vacuum SOLUTION ANSWER 4. At one postion and time, the electric field of an em wave in vacuum is 12.12 MV/m into the paper () and its magnetic field is 40.4 mT left ().Find the corresponding Poynting vector (direction relative to the paper). SOLUTION in calculating the magnitude. ANSWER Here l use MAGNITUDE DIRECTION .You are traveling north at 22 m/s in your convertible. You have just passed a truck, travelng south at 15 m (Thus, you are moving apart at 37 m/s.) The speed of sound is 342 m's. The truck is blasting a horn that you hea to be at 88 Hz. Find the frequency that the truck driver hears from her hom. (You should complete the sketch, writing L in one O and S in the other O. Then draw an arrow showing t positive (+) direction. Finally, add two arrows (with signed numbers) showing the L and S velocity components.) NE EQUATION USED SOLUTION ANSWER The truck driver has no speed relative to her horn so she hears f .(Fill in the subscript.) you truck

Explanation / Answer

5.

f = actual freuency

f' = frequency heard by by us = 88 Hz

VL = velocity of listener = 22 m/s

Vs = velocity of source = - 15 m/s

V = speed of sound = 342 m/s

using the equation

f' = (V - VL) f/(V - Vs)

88 = (342 - 22) f /(342 - (-15))

f = 98.2 Hz

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