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HW-21Solutions-03-26-08

# HW-21Solutions-03-26-08 - Lehigh University HW-21 Solutions...

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Lehigh University Physics 21, Spring 2008 March 26, 2008 HW-21 Solutions 21-1. (HRW 33-1) From Fig. 33-2 , approximate the (a) smaller and (b) larger wavelength at which the eye of a standard observer has half the eye's maximum sensitivity. What are the (c) wavelength, (d) frequency, and (e) period of the light at which the eye is the most sensitive? Figure 33-2 Solution: 1. (a) From Fig. 33-2 we find the smaller wavelength in question to be about 515 nm. (b) Similarly, the larger wavelength is approximately 610 nm. (c) From Fig. 33-2 the wavelength at which the eye is most sensitive is about 555 nm. (d) Using the result in (c), we have 8 14 3.00 10 m/s 5.41 10 Hz 555 nm c f × = = = × λ . (e) The period is T = 1/ f = (5.41 × 10 14 Hz) –1 = 1.85 × 10 –15 s. 21-2. (HRW 33-6) What is the wavelength of the electromagnetic wave emitted by the oscillator–antenna system of Fig. 33-3 if and ? Solution: 6. The emitted wavelength is ( ) ( )( ) 8 6 12 2 2 2.998 10 m/s 0.253 10 H 25.0 10 F 4.74m. c c LC f λ = = π = π × × × = 21-3. (HRW 33-9) A plane electromagnetic wave traveling in the positive direction of an

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HW-21Solutions-03-26-08 - Lehigh University HW-21 Solutions...

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