A student marks the positions of three successive compressions of a sound wave on a…

PHYSICS · Single correct · CBSE · Physics · Sound · Sound

Problem

A student marks the positions of three successive compressions of a sound wave on a distance axis at

0\,\text{m}

0.80\,\text{m}

and

1.60\,\text{m}

, but records the fourth compression at

2.30\,\text{m}

. Which conclusion about the student’s data is most appropriate? (a) All spacings are equal; the wavelength is

0.80\,\text{m}

(b) Taking the total distance from the first to the fourth compression, the wavelength is

\dfrac{2.30\,\text{m}}{3}\,\approx\,0.77\,\text{m}

(c) The first two spacings are consistent, but the third spacing is incorrect (d) The decreasing spacing shows the wavelength has shortened to

0.70\,\text{m}