EM Spectrum
This type of EM radiation has the shortest wavelength and highest energy.
gamma rays
Define amplitude.
Distance from centre line to crest or trough
Light is only visible when it does what?
interacts with materials
the angle of incidence is 50º what is the angle of reflection?
50º
Explain how eyelashes help protect the eye.
keeping dirt, dust and harmful bright light out of our eyes
A remote control uses which type of EM wave?
Infrared
What model explains interference?
Wave model
Why do we see a leaf as green?
It reflects green light and absorbs all the other colors in the spectrum
what type of mirror is a security mirror?
convex
What part of the eye contains rods and cones?
retina
Explain why gamma rays are more dangerous than microwaves.
They have a shorter wavelength and more energy
Why do scientists use visible light to study EMR?
It is safe and it behaves similarly to other types of EMR
Evaluate which behaviour of light (reflection, absorption, refraction) is most important for human vision.
refraction is the most important because it is the behaviour that allows the eye to focus light and form a clear image on the retina.
an object is more than 2 focal lengths away from a convex lens. what type of image is formed?
smaller, inverted
Explain why the iris gets smaller in bright light.
to reduce the amount of light in your eye as this could damage your eye
Why does UV radiation cause sunburn but visible light does not?
UV light has a shorter wavelength and more energy
Which model best explains the brightness of light? Support your choice with wave properties.
wave model: as brightness increases, amplitude increases
Which colour of visible light has the highest energy?
violet
what does an image look like inside a concave lens?
reduced (diminished)
what is the first structure that refracts light in the eye?
cornea
A student claims microwaves are more dangerous than ultraviolet radiation. do you agree or disagree and why?
disagree because UV has shorter wavelengths and higher energy, making it more harmful
Explain why the double-slit experiment produces alternating bright and dark bands.
- waves diffracted as they passed through the two slits.
- they interfered with each other resulting in constructive and destructive interference
- Where the waves add together → Bright bands
Where the waves cancel each other → Dark bands
Predict how a shadow changes when the light source moves closer.
the shadow gets bigger
which does light travel fastest in? (oil, air or water?)
air
Compare nearsightedness and farsightedness in terms of eye shape.
Far-sighted vision: image falls behind the retina (eye has a shorter shape than normal)
near -sighted vision: image falls short of the retina (eye has a longer shape than a normal eye)