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This question is about ultrasound - Edexcel - GCSE Physics - Question 1 - 2021 - Paper 1
Question 1
This question is about ultrasound. (a) Which of these is a frequency of ultrasound? ☐ A 2.3 Hz ☐ B 23 Hz ☐ C 23 kHz ☐ D 23 kHz (b) Ultrasound has many uses. (i) ... show full transcript
Worked Solution & Example Answer:This question is about ultrasound - Edexcel - GCSE Physics - Question 1 - 2021 - Paper 1
Step 1
Step 2
Explain why the device affects mice but does not affect humans.
Answer
The device emits ultrasound at frequencies that are within the range that mice can hear, while humans generally can hear frequencies only up to about 20 kHz. Mice have more sensitive hearing in the ultrasound range, making them more affected by such devices, while humans are largely unaffected.
Step 3
Describe how the technician can use this device to determine the speed of ultrasound in air.
Answer
The technician can calculate the speed of ultrasound in air using the formula: ext{Speed} = rac{ ext{Distance}}{ ext{Time}} By measuring the time it takes for the ultrasound pulse to travel to a surface and back (echo), and knowing the distance to the surface, the technician can determine the speed of ultrasound in air.