Question

1.Give the reason why sound waves can go around most of objects.

2. Give the reason why most of objects block light waves.

3. From the video, what is the correction about the speed of red light compare with the one of the purple light?

4. Explain why waves going through a larger hole will not spared as much and move forward as going through a smaller hole?

Answer 1

(1)

The bending of waves around obstacles is called diffraction of waves. As sound waves shows the property, "diffraction" sound waves can go around most of objects. Diffraction effects larger for greater wavelength of sounds that are what we experienced in most of object.

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(2)

Light waves have much shorter wavelengths as compared to sounds , they are far easier to block out. As wavelengths are shorter, light waves are easier to blockout. Light waves travel through few solid materials, such as glass and plastic.

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(3)

Speed of light, c = ( freqeuncy ) (wavelength )

All light travels at speed 3 x 10^8 m/s. Wavelengths are just measurements between the crests of waves. frequency doesn't affect speed. Frequency and wavelength are varies depends one to another, however, for a particular medium, they remains same. Hence, the speed of wave stays the same.

Both red light and purple light have same speed, irrespective of wavelengths.

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(4)

As the wavelengths are comparable to diameter of circular aperture ( hole), they can propagate through larger holes and shows less diffraction at edges. ( In this casae, the diameter of ciicular apertue greater and enough comparable )

In the case of smaller holes, the waves shows greater diffraction as their wavelengths bit smaller than the diameter of aperture.