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Electronics and Communication Analog Electronics Difficulty: Medium

A step index fibre has core diameter 40 µm with core refractive indix of 1.3 and numerical aperture 0.5, then the refractive index of cladding is Hooke's law is written as If the PRF is 1200 and the pulse width is 1.5 µs, the duty cycle will be Match List-I with List-II in regard to Fourier series of periodic f(t) and select the correct answer using the options given below: List-I (Properties) List-II (Characteristics of the trigonometric form) a. f(t) + f(-t) = 0 1. Even harmonics can exist b. f(t) - f(-t) = 0 2. Odd harmonics can exist c. $${\text{f}}\left( {\text{t}} \right) + {\text{f}}\left( {{\text{t}} - \frac{{\text{T}}}{2}} \right) = 0$$ 3. The dc and cosine terms can exist d. $${\text{f}}\left( {\text{t}} \right) - {\text{f}}\left( {{\text{t}} - \frac{{\text{T}}}{2}} \right) = 0$$ 4. sine terms can exist 5. cosine terms of even harmonics can exist Blackbody radiation is enclosed inside a spherical cavity of radius r at a temperature T. What would be the temperature of the enclosure if the radius expands to 2r adiabatically?