Question

A SOUND WAVE WITH ITS CHARACTERISTIC PATTERN OF COMPRESSIONS AND
RAREFACTIONS IS SHOWN BELOW. A CENTIMETER RULER IS INCLUDED BELOW THE
PATTERN THE WAVELENGTH OF THIS SOUND WAVE IS HOW MANY cm?
A 2 cm
B 3 cm
C 35 cm
D. 85 cm
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Answer 1

Answer:

The wavelength is 1.7cm

Explanation:

Given

See attachment for wave pattern

Required

What is the wavelength

To do this, we simply calculate the distance between successive waves (see attachment 2 for point A and B)

Using the ruler, points A and B are at:

$A = 0.6cm$

$B = 2.3cm$

So, the wavelength is:

$\lambda = B - A$

$\lambda = 2.3cm - 0.6cm$

$\lambda = 1.7cm$

If approximated, the wavelength is:

$\lambda \approx 2cm$