It's been a while I haven't give Physics lesson. In interference, you learnt the

**wavelength = ax/D**formula. Now, let's have some fun regarding the**sound wave experiment interference**, as shown in diagram below:
You can see the relationship between the

**distance between two coherent speakers, a**(dog) and the**distance between two loud sound heard, x**(cat). That's because they are*inversely proportional*(cat & dog always fight!). But your teacher can easily teach their relationship via the formula itself.f!Af! (barking sound) VS Assss! (cat hissing)X |

First, let's see the variables (simplified):

**MV**:

**a**(you

*change*the distance between speakers)

**RV**:

**x**(you

*measure*the distance between two loud sound)

**CV**:

**D**(you

*maintain*the distance between you and the speakers).

Hence, we arrive at the hypothesis (simplified):

*"The larger the*

**a**, the smaller the**x**."
The teachers can show this as the advance organizer (from Ausubel) before the experiment starts. For the rest of you guys, have fun! :-)

REPSECTO.

**Gong Xi Fa Chai!**新年快樂.

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