BISOPE series
46- How do sound waves travel where there is no light? (refraction and
diffraction)
-------------------------------------------------------------------------------------------------------------
We are taught that light is faster than anything else,
so we miss the meaning of having powerful energy. Therefore, wherever the light
reached, there was hot energy. However, it was not always so where the sound
reached. I could hear the sound even in the dark. I heard it even though it was
blocked.
If sound and light are transmitted to an invisible
place, let's say that they can be seen as passing through an obstacle or being
reflected secondarily on another plane. But if you can hear sound in the back
corner where there is no such thing, how on earth can you explain this?
Huygens–Fresnel principle
Waves appear in the form
of light, sound, surface waves, earthquakes, vibrations, etc., and have
characteristics of reflection, refraction, and diffraction. Light is a
transverse wave in which the direction of vibration of the medium and the
direction of propagation of the wave are different, but sound is a longitudinal
wave having a wave of low density (low density, high density medium) in the
direction of propagation of the wave. If the sound propagation direction is
referred to as a sound ray, the perpendicular plane is called a 'wavefront' (a
plane obtained by connecting all points of the same phase when the wave
propagates).
The principle by which
sound can be heard in a confined, narrow, and dark place is explained by
Huygens' principle. “Each point on one wavefront becomes the point source of
the next wavefront, and a spherical wave is generated. The envelope that
touches all of the spherical waves created by these point sources becomes the
next wavefront.” Huygens' principle can be used to explain the phenomena
of reflection, refraction, interference, and diffraction of waves.
|
division |
Refraction |
Diffraction |
|
explanation |
bending of the sound ray |
Propagation of sound in areas behind
obstacles |
|
theory |
Snell's
Law When the
medium changes, the angle of incidence and angle of transmission change. |
Huygens–Fresnel
principle |
|
phenomenon |
- deflects to the lower speed of sound - Refraction towards the lower temperature. - bends in the direction the wind blows |
- The larger the wavelength, the more
diffraction occurs. -The smaller the size of the obstacle (the
smaller the hole, the more diffraction. |
