Curriculum
Course: AS Physics 9702
time left:
:
:
Login

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

24.1.3 Specific Acoustic Impedance – Check yourself

Submit quiz
Once you submit, you will no longer be able to change your answers. Are you sure you want to submit the quiz?
1.
The SI unit of specific acoustic impedance is
kg m−3
N m−2
m s−1
kg m−2 s−1
2.
A medium of density 900 kg m−3 has c = 1450 m s−1. Z is about
1.6 × 103
1.3 × 106
6.2 × 10−1
2.2 × 103
3.
Strong reflection occurs at a boundary when
the two impedances are equal
the frequency is low
the two impedances are very different
the media have the same density
4.
A gel with Z similar to skin is used to
reduce reflection at the probe-skin boundary
increase the speed of ultrasound
focus the beam
cool the skin
5.
Which property pair determines acoustic impedance?
Density and wavelength
Density and speed of sound
Frequency and amplitude
Mass and volume
6.
Bone gives strong echoes in an ultrasound scan because
its density is low
it absorbs ultrasound completely
it has the same impedance as muscle
its impedance is very different from soft tissue
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
Accepted payment methods