Application Of Interference Of Waves 6t3m2l

Application of interference of waves Noise Cancellation  





Noise cancellation is a method to reduce or completely cancel out undesirable sound. A noise-cancellation speaker emits a sound wave with the same amplitude, frequency but anti-phase with the original sound. The waves will combine each other in a process called destructive interference, eventually the waves will cancel each other and there would be no sound. The sum of the waves is equal to zero.

Application of noise cancellation: 1.

Headphone - people working near aircraft or in noisy factories can now wear these electronic noise cancellation headsets to protect their hearing. 2. Cars - The way it works is that a microphone connected to the car stereo system picks up all the sound inside the car, including music or such from the stereo. Then the noise-cancellation system subtracts the sound of the music coming from the stereo and produces noisecancelling sound waves that match the frequency of unwanted sound. 3. Aircraft - The system uses microphones to pick up the vibrations due to jet's engine in the cabin walls. It then analyzes the signals and generates counter vibrations in the walls to produce a net result of zero vibrations.

Alternating loud and soft sounds are detected as the microphone is moved from left to right. Explanation :The two loud speakers are sources of two coherent sound waves as they are connected to the same audio signal generator. The alternating loud and soft sounds are caused by interference of the sound wave.

Young's Double Slit Experiment Young's double-slit is made up of two slits ruled on a piece of slide and painted with'aquadak'. •When monochromatic light es through the Young's double-slit, diffraction of light occurs and two coherent sources (same amplitude, frequency and phase) are produced as shown in the diagram above • The two coherent sources will overlap and superpose to produce the effects of constructive and destructive interference. • Constructive interference generates bright fringes while destructive interference produces dark fringes. • Fringe size of bright fringes and dark fringes are about similar in size. Fringe separation between any dark fringe and a neighbouring bright fringe which alternates in position with the former is the same.

Application of interference of waves

Factor that affects interference pattern a) wavelength

Relationship:

Notes: In some regions where the water is still, without any ripples, the crests and troughs of the two waves coincide and eliminate each other (destructive interference). Since the amplitude is zero, there is no wave motion. b) Different distances between the two sources of waves

Relationship: The distance between two consecutive node (or antinode) lines, x, is inversely proportional to the distance between the two sources.