Question 3: Dolphins communicate through the emission and reception of sounds. A young dolphin was separated from its mother and started whistling at a frequency of 150,000 kHz to call for help. The speed of sound in seawater is 480 m/s. Explain the term ultrasound. 3.2 Calculate the wavelength of the young dolphin's whistle. 3.3 Another dolphin hears the distress call of the young dolphin 2 seconds later. How far apart are the two dolphins from each other? 3.4 The speed of sound in air is 340 m/s. Briefly explain why the speed of sound in air is different from the speed of sound in seawater. 3.5 Describe how dolphins use echolocation to hunt their prey. [15]
Question 3: Dolphins communicate through the emission and reception of sounds. A young dolphin was separated from its mother and started whistling at a frequency of 150,000 kHz to call for help. The speed of sound in seawater is 480 m/s. Explain the term ultrasound.
3.2 Calculate the wavelength of the young dolphin's whistle.
3.3 Another dolphin hears the distress call of the young dolphin 2 seconds later. How far apart are the two dolphins from each other?
3.4 The speed of sound in air is 340 m/s. Briefly explain why the speed of sound in air is different from the speed of sound in seawater.
3.5 Describe how dolphins use echolocation to hunt their prey.
