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CBSE Class 12-science Answered

Two students are separated by a 7m partition wall in a room 10m high. If both light and sound waves can bend around obstacles, how is it that the students are unable to see each other even though they can converse easily?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

For diffraction effect size of the aperture or object should be comparable to the wavelength of wave. In the present example the size of the obstacle is of the order of few meters whereas wavelength of light is about 6000 =6 x 10-7m.

Therefore diffraction of light is almost zero. However, for audible sound waves of frequency 1 KHz, the wavelength is As a result, the sound waves can bend round the partition and students sitting on opposite sides of partition wall can converse freely.
Answered by | 04 Jun, 2014, 03:23: PM
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