EE119 Discussion Section 1 (01/25/10) Professor: Jeff Bokor TA: Xi Luo Example Problems 1. Light as Wave – Hecht 3.1 consider the plane electromagnetic wave (in SI units) given by the expression E x = 0, E y = 2cos[2 π × 10 14 (t – x/c) + π /2], and E z = 0. What are the (a) frequency, angular frequency, (b) wavelength, wave-vector (propagation constant), (c) direction of motion, (d) phase velocity, initial phase angle, (e) amplitude and the polarization of the wave? 2. Light as a Particle – the room light in a classroom with average power of 5 μ W hitting a detector that has an area of 1 cm 2 . How many photons are hitting the detector per second if they are all red photons ( λ = 700nm)? How many if they are all violet photons (( λ = 400nm)? 3. Reflection, Refraction and Total Internal Reflection – Prof. Bokor throws you out of a helicopter into a sea of unknown liquid with only a protractor in hand. He then flies away to an angle of 49°, relative to the surface normal. You dive
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