1)Suppose a certain laser can provide 80 TW of power in 1.2 ns pulses at a wavel
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Question
1)Suppose a certain laser can provide 80 TW of power in 1.2 ns pulses at a wavelength of 0.29 µm. How much energy is contained in joules in a single pulse?2)The maximum electric field 12 m from a point light source is 1.8 V/m. What are (a) the maximum value of the magnetic field and (b) the average intensity of the light there? (c) What is the power of the source?
3)In Fig. 33-40, initially unpolarized light is sent into a system of three polarizing sheets whose polarizing directions make angles of ?1 = ?2 = ?3 = 62° with the direction of the y axis. What percentage of the initial intensity is transmitted by the system? (Hint: Be careful with the angles.)
4)Figure 33-49 shows light reflecting from two perpendicular reflecting surfaces A and B. Find the angle (in o) between the incoming ray i and the outgoing ray r'.
5)In Fig. 33-57, a ray of light is perpendicular to the face ab of a prism (n = 1.43). Find the largest value for the angle ? so that the ray is totally reflected at face ac if the prism is immersed (a) in air and (b) in water (n=1.33).
Explanation / Answer
1 ) A laser can provide a Power P = 80.0 TW = 80.0 *10^12 W time t = 1.2 ns = 1.2*10^-9 s Energy contained in a single pulse is E = P * t = 80.0 *10^12 W * 1.2 *10^-9 s = 9.6*10^4 J 2 ) Given that maximum electric feld is E = 1.8 V /m a ) Maximum magnetic field is B = E / c = 1.8 V /m / 3.0*10^8 m/s = 0.6*10^-8 T b ) Average intensity of the light is S = E B / 2_0 = 1.8 V /m * 0.6*10^-8 T / 2 *4*10^-7 = 4.299*10^-3 W /m^2 c ) Power of the source is P = S A = 4.299*10^-3 W /m^2 * 4 ( 12.0m)^2 = 2.376*10^-6 W please post questions with figuresRelated Questions
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