01-28-2013, 10:50 PM
PHY101 Physics Assignment No.4 Solution Fall Semester 2013
Question # 1
I. Why a light wave is always transverse in nature? Marks 9 (4+5)
II. Radio signals and light waves are fundamentally different. Is it true or wrong? Justify
your answer by giving a solid reason in each case.
Question # 2
I. Is it possible for electromagnetic waves to pass through a matter? If yes give examples if
not explain it. Marks 11 (4+7)
II. Why is our sky blue rather than some other color? Sun as yellow rather than white and
sun appears to change color when it sets in west. Give a precise answer and avoid from
unnecessary explanation.
Question # 3
Why you hear a friend down the hallway calling you, even though he/she is out of your line of
sight? Explain it. Marks 4
Question # 4
Is it true or wrong that if the light rays are not coherent, we would not be able to see
interference? Explain it by giving an example. Marks 5
Question # 5
If the path length difference in a double-slit interference pattern equals one wavelength, the
result is complete destructive interference. Is it yes or no explain in each case? Marks 6
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