What are the main two types of energy?
Stores (potential) and Active (kinetic)
In which objects does light travel through
a. Opaque
b. Transparent
c. Translucent
b and c
Translucent objects allow for some light to go through
What is refraction?
a. bouncing light
b. bending light
Bending light
What is the nemonic we use to remember the order of the colours in the rainbow?
ROY G BIV
Sound can travel through air, liquid and solids
yes
What is the unit we use for Energy?
Joules
What is the speed of light? And what type of wave is it?
300,000 Km/s or 300,000,000 m/s
Light is a transverse wave
What happens to white light when travels through a triangular prism?
Refracts into the 7 colours of the rainbow (visible spectrum of light)
Which colour has the smaller wavelength
Violet
Sound travels faster through
a. air
b. liquid
c. solid
Because
Through solid because particles are closer together
What is Energy Efficiency?
The percentage of energy that is not wasted.
For example: some times energy can be wasted in the form of heat. Electricity light a bulb but not all the energy is used as light, some gets wasted as heat.
Does light travel through vacuum (space)?
How about sound?
Light travels through vacuum but sound can't because there are not enough particles in space for sound to travel through
Using a flat mirror how are the angle of incidence and the angle of reflection?
The same
What are the colors reflected by a red car?
Red
What is the unit we use to measure sound?
Decibels (Db)
How do you define Renewable Energy?
Energy that does not un out
A disturbance that travels through a medium from one location to another location is a
wave
Is this a concave or a convex mirror?
Convex mirror.
Are curved outwards and are sued as security mirrors in shops because they give a wide field of view
What is the part of our eye that controls the amount of light going through the lens into the retina?
pupil
Relate loudness and pitch to amplitude and frequency of a wave
The amplitude is the loudness of a sound, the frequency is the pitch of sound
What does the principle of conservation of energy say?
That energy is not created or destroyed, it transforms form one type to another.
Define and give the units for:
- wavelength
- amplitude
- frequency
- wavelength: distance between two crests of a wave (metres)
- amplitude: height of a wave (metres)
- frequency: number of waves per second (Hertz)
What causes refraction?
The change in the speed of light when changing mediums of different density
What do our ears and eyes have in common?
That sound and images are sent to the brain through electrical impulses
Name the parts of the ear in order from outer ear to inner ear
Ear, Auditory canal, Eardrum, Ossicles, Cochlea, Auditory Nerve, Brain