Summary: The learning object includes the topic of sound waves and the intensity of a sound wave using an echolocation example. Dolphins use echolocation to communicate as they have their own signature whistle. Thus, when a calf (baby dolphin) is separated from the rest of the pod, the mother dolphin tries to relocate the calf using her signature whistle. We calculate the frequency of the sound wave, determine whether or not the calf hear the whistle, and the intensity of the sound wave.