Some students in science class have made a poster with a photograph showing several stationary circular ripples in a coffee cup. They have labeled the distance from the rim of the cup to the center as the wavelength of the sound wave. What error did they make?

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.