Topic 6 - Waves Flashcards
What is a transverse wave and examples
a wave where the oscillations are perpendicular to the direction of energy transfer
for example water waves , Em waves , light waves , radio or string waves
What is a longitudinal wave and examples
a wave where the oscillations are parallel to the direction of energy transfer
for example sound or seismic waves
which type of reflection is which
specular - clear image bc flat surface , the normals are all in the same direction
Diffuse - no image because bumpy surface , normals are all at different directions
Order of EM spectrum, from longest wavelength to shortest
R M I V U X G
as wavelength decreases …
frequency increases
How to generate radio waves
Oscilloscope is connected to a transmitter
the oscilloscope determines the frequency of the wave transmitted, oscillates
a receiver absorbs the energy transmitted and generates the wave in an A.C current that is displayed on an oscilloscope
both frequencies are the same
Where are x rays absorbed by
X-rays are absorbed by denser objects but pass through less dense objects
the areas that absorbed radiation appear white
convex(converging) and concave lens
convex(converging) lens refracts parallel rays of light inwards to a single point
concave lenses refract parallel rays of light outwards to disperse the light
distance from the principle to the centre of the lens is
the focal length, the shorter the focal length, the more powerful the lens
what type of image can be formed by a convex and concave lens
The image from a convex lens can be either real or virtual. The image produced by a concave lens is always virtual.
What is a ‘real’ image
where light rays do come together to form an image so the image is upside down ( INVERTED)+ smaller/bigger - eg ur eye sees images upside down but brain flips it
What is a ‘virtual’ image
when the light rays don’t come together where the image appears to be - so the image is upright eg a mirror
differences between P waves and S waves
P-waves are longitudinal, seismic waves. P-waves travel at different speeds through solids and liquids.
S-waves are transverse, seismic waves. S-waves cannot travel through a liquid. P-waves and S-waves provide evidence for the structure and size of the Earth’s core.
