Curriculum
Course: AS Physics 9702
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Curriculum

AS Physics 9702

1. Physical quantities and kinematics

0/41 Dr Dabour Hub Science Diagram and Course Material

2. Dynamics, forces and pressure

0/46 Dr Dabour Hub Science Diagram and Course Material

3. Work, energy, power and deformation

0/31 Dr Dabour Hub Science Diagram and Course Material

4. Waves and superposition

0/39 Dr Dabour Hub Science Diagram and Course Material

5. Electricity and D.C. circuits

0/49 Dr Dabour Hub Science Diagram and Course Material

7. Circular motion and gravitational fields (A Level)

0/25 Dr Dabour Hub Science Diagram and Course Material

8. Thermal physics (A Level)

0/37 Dr Dabour Hub Science Diagram and Course Material

10. Electric fields and capacitance (A Level)

0/36 Dr Dabour Hub Science Diagram and Course Material

11. Magnetic fields and alternating currents (A Level)

0/46 Dr Dabour Hub Science Diagram and Course Material

12. Quantum and nuclear physics (A Level)

0/44 Dr Dabour Hub Science Diagram and Course Material

13. Medical physics and astronomy (A Level)

0/42 Dr Dabour Hub Science Diagram and Course Material
Quiz

24.1.5 Attenuation of Ultrasound in Matter – Check yourself

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1.
Intensity falls from 80 to 20 W m−2 in a medium of thickness 5 cm. The half-value thickness is
5.0 cm
2.5 cm
10 cm
1.25 cm
2.
For I = I0e−μx, the unit of μ is
m−1
m
W m−2
dimensionless
3.
A graph of ln I against x has gradient −40 m−1. Then μ is
e40 m−1
−40 m−1
0.025 m−1
40 m−1
4.
Increasing the frequency of the ultrasound
reduces μ and increases penetration
has no effect on μ
increases μ and reduces penetration
removes scattering
5.
A beam passes through 2.0 cm with μ = 30 m−1. The fraction transmitted is
0.55
0.45
0.74
0.060
6.
Which are the main causes of attenuation of ultrasound within tissue?
Refraction and diffraction
Interference and resonance
Polarisation and reflection
Absorption and scattering
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