See Sound 2: Interference of Sound by Enora's group

Interference by definition:


The combination of two or more electromagnetic wave forms to form a resultant wave in which the displacement is either reinforced or cancelled.

Wow.. COULD CATCH MUCH ISN'T. When our five senses are lazy..so does our brain. so lets makes Physics Fun!

 Presentation from my student, Enora. Let them acquires knowledge by Evidence! No hard work for us teachers, instead the students learns in a fun way and understand more!

Interference by Theory:

Interference in Physics Paper 3 SPM:

In the exp. above:

a = distance between two loudspeaker
x = distance between two successive constructive or destructive interference
𝝺 = wavelenght
D = distance between source and screen

(i)  Aim: To investigate the r/ship between a and x
(ii) Mv: a            Rv: x               Cv : D and 𝝺
(iii) Speakers (Left and Right), frequency/wave generator, mahjong paper, spectrum analyser                     application, meter rule.
(iv) (Refer pic./diagram below)
(v) Procedure:
      1. Distance between a is started at 20 cm.
      2. Measure the x that is shown in the spectrum analyser.
      3. Distance of a is increased to 30cm, 40 cm, 50cm and 60 cm and reading of x is measured                    accordingly.
      4. The reading of a and x are recorded.
(vi) Table of a and x
(vii) graph of a against x is plotted

Interference by Experiment:

Table :

Graph:

Analysis of graph:

wow this is a lot isn't? Nope wait until you see the presentation by Polee's group. Sound interference with different manipulated variable and responding variable. It is done on the same day (experiment and collecting data) and presented on the next session ( presentation, reconstruction of understanding and reflection).