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What are the two main categories of waves?
Which type of wave has oscillations perpendicular (at right angles) to the direction of energy transfer?
Transverse ( transverse means across)
Which type of wave has oscillations parallel to the direction of energy transfer?
What do waves transfer from one place to another?
Are electromagnetic (EM) waves transverse or longitudinal?
Are sound waves transverse or longitudinal?
Are mechanical waves transverse or longitudinal?
They can be either
Which type of electromagnetic (EM) wave travels the fastest through a vacuum?
All EM waves travel at the same speed in a vacuum
Put these EM waves into the correct order (lowest frequency first)
gamma ray, x-ray,radio, infrared, visible, microwave, ultraviolet
- radio (lowest frequency)
- gamma ray
Is the energy of a wave proportional to its wavelength or its frequency
What name is given to the area in a longitudinal wave where the particles have been moved apart?
What name is given to the area in a longitudinal wave where the particles have been moved closer together?
What are the three wave phenomena?
What size does the gap or obstacle need to be if there is to be an appreciable amount of diffraction?
Similar to the wavelength of the wave
Where does refraction occur?
At the boundary (interface) between two materials
What is the change of direction of waves at an interface between two materials called?
represent in the wave equation
The wavelength of the wave
Which type of EM wave is used in TV remote controls?
Which types of communication devices use microwaves?
Mobile telephones and satellite TV
When constructing ray diagrams, what is the normal?
- A line perpendicular (at right angles) to the reflecting (or refracting) surface at the point of incidence.
- (It is called a construction line as it is used in determining where to draw rays)
What is the relationship between the angle of incidence and the angle of reflection?
They are always equal
What 3 properties do images produced in a plane mirror have?
- virtual (cannot be projected onto a screen)
- laterally inverted (back to front horizontally)
What wave property does the pitch of sound relate to?
What wave property does the loudness of sound relate to?
What is the focal length of a converging lens?
- The distance from the centre of the lens to the point at which parallel rays are brought to a focus.
What shape is a diverging lens?
Do converging lenses bring light rays together or move them apart?
Bring them together
What is meant by the critical angle of a material?
The mininum angle of incidence at which Total Internal Reflection (TIR) happens.
What is the difference between a real and a virtual image?
Real images can be projected onto a screen. (Light rays converge to a point for real images)
Virtual images cannot be projected onto a screen. (Light rays appear to come from a virtual image but they do not actually intersect each other)
What 3 things define an image?
- Size (magnified or diminished),
- orientation (upright or inverted),
- type (real or virtual)
What property of a material is defined by
The refractive index
What shape is a converging lens?
Do lenses use refraction or reflection?
What are echoes?
What would you like to do?
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