. Which of the following physicist did not theorized the electromagnetic nature of light? (answer only) a. Heinrich Hertz b. Michael Faraday c. Christiaan Huygens d. James Clerk Maxwell 2.15. What is the frequency of a yellow light if the energy that it can emit is equal to (answer only) 3.4 x 10-19 J? a. 2.2 x 10-19 J b. 3.6 x 10-19 J c. 4.5 x 10-19 J d. 5.1 x 10-19 J 3.What happens to the speed of light when it travels from air to glass? (answer only) a. Its speed increases b. Its speed decreases c. Its speed remains the same d. Its speed decreases then increases

In which region of the electromagnetic spectrum does absorption at 200 nm come? Select one: a. Visible b. Radio wave c. Infrared. d. Ultraviolet

A photon of light has a frequency of 5.00 x 1014 Hz. If the frequency of the photon was doubled then which of these would happen to the energy of this photon?   a. it would become one-fourth as much   b. it would become half as much   c. it would double   d. it would quadruple   e. it would triple

Q16. For a frequency modulated signal V(t)=15sin(15 ×10ʻt+2.5sin(2750t)), the amplitude of modulating signal is 3.5V. Refer the Bessel function table B16. i) Sketch the voltage spectrum for the above signal. ii) Calculate maximum frequency, minimum frequency, maximum frequency deviation, Bandwidth, amplitude of maximum frequency from the spectrum. iii) Identify whether the above equation corresponds to Narrowband or Wideband FM modulator. Justify your answer. Table B16: Values of Bessel function Modulation Sideband index Carrier 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 0.00 1.00 0.25 0.98 0.12 0.5 0.94 0.24 0.03 1.0 0.77 0.44 0.11 0.02 1.5 0.51 0.56 0.23 0.06 0.01 2.0 0.22 0.58 0.35 0.13 0.03 0.52 0.43 0.20 0.06 0.02 -0.05 0.50 0.45 0.22 0.07 0.02 0.01 2.41 2.5 -0.26 0.34 0.49 0.31 0.13 0.04 0.01 -0.40 -0.07 0.36 0.43 0.28 0.13 0.05 0.02 -0.18 -0.33 0.05 0.36 0.39 0.26 0.13 0.05 0.02 3.0 4.0 5.0 5.53 -0.34 -0.13 0.25 0.40 0.32 0.19 0.09 0.03 0.01 6.0 0.15 -0.28 -0.24 0.11 0.36 0.36 0.25…