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
Complete the sentence by putting a cross (✗) in the box next to your answer.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is D: ultrasound waves. Dolphins emit sounds at frequencies higher than 20 kHz, which classifies them as ultrasound.
Step 2
Describe how a dolphin uses high frequency sound to locate the position of the fish.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Dolphins use echolocation to locate fish. They emit high-frequency sounds that travel through the water. When these sound waves hit a fish, they reflect back to the dolphin's sonar system, allowing the dolphin to determine the fish's location based on the time it takes for the echoes to return and the characteristics of the reflected sound.
Step 3
Explain which is the best type of sound wave for whales to use when communicating over long distances.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The best type of sound wave for whales to use for long-distance communication is infrasound. Infrasound can travel long distances underwater with less attenuation, which means it remains audible for a longer time and can be detected from farther away.
Step 4
Complete the sentence by putting a cross (✗) in the box next to your answer.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct answer is B: seismic waves. These are the sound waves used by geologists for oil exploration.
Step 5
Suggest why the waves are reflected from the oil field.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The waves are reflected from the oil field because of the difference in density between the oil and the surrounding rock layers. The change in material properties causes a portion of the sound waves to bounce back.
Step 6
Calculate the speed of the wave.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The speed of the wave can be calculated using the formula:
