Curriculum
Course: Igcse Physics
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Curriculum

Igcse Physics

1. Motion, Forces and Energy

0/161 Dr Dabour Hub Science Diagram and Course Material

2. Thermal Physics

0/75 Dr Dabour Hub Science Diagram and Course Material

3. Waves

0/77 Dr Dabour Hub Science Diagram and Course Material

4. Electricity and Magnetism

0/119 Dr Dabour Hub Science Diagram and Course Material

5. Nuclear Physics

0/39 Dr Dabour Hub Science Diagram and Course Material

6. Space Physics

0/47 Dr Dabour Hub Science Diagram and Course Material
Quiz

3.4.4 Ultrasound – Check yourself

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1.
Ultrasound has a frequency
between 20 Hz and 20 kHz
above 20 kHz
of exactly 20 kHz
below 20 Hz
2.
A pulse takes 0.20 s to travel to the sea bed and back at 1500 m s−1. The depth is
3000 m
75 m
150 m
300 m
3.
Why is gel put on the skin during an ultrasound scan?
To make the picture brighter
To stop X-rays
To keep skin cool
To remove the air gap
4.
Which is a use of ultrasound?
Sterilising food
Cleaning delicate objects
Heating buildings
Radiotherapy
5.
An advantage of ultrasound scans over X-rays is that ultrasound
travels faster
is ionising
is non-ionising
has a longer wavelength
6.
Ultrasound of 4.0 MHz travels at 1600 m s−1 in tissue. Its wavelength is
0.25 mm
4.0 mm
6.4 mm
0.4 mm
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