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Shalini Jha asks:
“What is Diffraction?”
Diffraction is the bending of a wave around obstacles in its path. The diffraction effects are prominent when the size of he obstacle is comparable to the wavelength of the wave.
Sound waves can bend around large obstacles as it has got a large wavelength. But light waves can bend only around tiny sharp obstacles as it has a short wavelength.
"the displacement of a particle in periodic motion is given by "y=(cos2t-2cost+2sin^2t+1). What is the no. of beats that can be heard in 10 seconds?"
Iqbal Lucky asked
“when a wave enters from air to water, its wavelength changes but
frequency remains unchanged. why”
Velocity of a wave = frequency x time period
V = ν λ
When a wave travels from one medium to another, its velocity changes and so also is its wavelength, but frequency; which is the number of vibrations produced per second is independent of the medium, remains constant.
However, their is a phenomenon called Doppler Effect where the apparent frequency (observed frequency) is different from actual frequency and is caused by the relative movement between the source and observer (listener)
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Akashjot Kaur asks
“how a wave travels ? eg. light has dual nature ,since light consists of particles ,and in the wave character we say it moves in the form of electric & magnetic perpendicular wave.how is it possible? it travels in the form of waves or particles?”
Answer to be posted soon