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39 Cards in this Set
- Front
- Back
What do waves transfer? (1 mark)
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Energy |
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What are the two different type of waves? (1 mark) |
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Give some examples of transverse wave. (1 mark) |
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Give some example of longitudinal wave. (1 mark) |
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Do all electromagnetic waves travel at same speed? (1 mark) |
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What speed to electromagnetic waves travel at? (1 mark) |
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What is the difference between transverse and longitudinal waves? (2 marks) |
Transverse waves: Vibrations are perpendicular (at 90 degrees) to the direction of travel |
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What are the two areas of longitudinal waves? (1 mark) |
Compression (where the particles are squashed together) |
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State 3 properties of waves? (1 mark) |
Reflection, refraction and diffraction |
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Which waves can be used for communication? (4 marks) |
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What is the wave speed equation? (1 mark) |
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What is the unit of frequency (f)? (1 mark) |
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Metres (m) |
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Define frequency. (2 mark) |
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Define wavelength. (1 mark) |
The length of one complete wave |
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State the law of reflection. (1 mark) |
Angle of Incidence = Angle of Reflection |
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What is the relationship between the angle of incidence and the angle of reflection? (2 marks) |
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(2 marks) |
A real image is made when the rays of light from the same place on the object actually cross. Real image is formed on projector screen. |
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State the characteristics of the image made by a plane mirror. (1 mark) |
Upright, same size as object, same distance from mirror as object, laterally inverted, virtual |
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What is an echo? (1 mark) |
An echo is the reflection of sound waves that can be heard |
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What is the definition of refraction? (1 mark) |
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What is the relationship between the angle of incidence and the angle of refraction? (2 marks) |
The angle of refraction is smaller than the angle of incidence |
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What is the definition of diffraction? (1 mark) |
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What determines the amount of diffraction of a wave? (1 mark) |
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What factor determines the pitch of sound? (1 mark) |
The frequency of wave High frequency = High pitch Low frequency = Low pitch |
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What factor determines the loudness of sound? (1 mark) |
The amplitude of wave Large amplitude = Loud sound Small amplitude = Quiet sound |
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What is an echo? (1 mark) |
Echo is a reflected sound of the wall |
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Describe what the Doppler Effect is. (2 marks) |
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What is red shift? (1 mark) |
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How does red shift suggest that the universe is expanding? (3 marks) |
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What evidence is there for the Big Bang? (2 marks) |
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What is cosmic background radiation (CMBR)? (1 mark) |
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