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Dolphins emit sounds at many different frequencies - Edexcel - GCSE Physics - Question 4 - 2013 - Paper 1
Question 4
Dolphins emit sounds at many different frequencies. (i) Complete the sentence by putting a cross (✗) in the box next to your answer. A dolphin can produce sounds w... show full transcript
Worked Solution & Example Answer:Dolphins emit sounds at many different frequencies - Edexcel - GCSE Physics - Question 4 - 2013 - Paper 1
Step 1
Step 2
Describe how a dolphin uses high frequency sound to locate the position of the fish.
Answer
Dolphins use echolocation to locate fish. They emit sound waves, which travel through the water and bounce off objects. When the sound waves hit a fish, they return to the dolphin. The dolphin interprets the time it takes for the sound waves to return, allowing it to determine the fish's distance and direction. The high frequency of the sound waves creates clearer images of smaller objects, making it easier for dolphins to spot and track fish.
Step 3
Explain which is the best type of sound wave for whales to use when communicating over long distances.
Answer
The best type of sound wave for whales to use is infrasound. Infrasound travels further than higher frequency sounds because it experiences less attenuation over long distances in water. This allows it to maintain its amplitude better, making it detectable by other whales at great distances.
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Step 5
Suggest why the waves are reflected from the oil field.
Answer
Waves are reflected from the oil field due to the difference in density between the oil and the surrounding rock. When sound waves encounter a boundary between two mediums with different densities, some of the waves are reflected back, which helps geologists detect underground oil.
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