What is displacement in waves?
How far a point on the wave is from the rest position
Why do we see ourselves in mirrors?
Because mirrors reflect light.
What does a vibrating object like a speaker vibrate?
Air particles.
How do we calculate speed?
Distance ÷ Time
True or False. The higher the refractive index, the faster the light travels though a material.
False. The higher the refractive index, the slower it travels.
What unit do we use to measure the frequency of a sound wave?
Hertz (Hz)
What does frequency mean?
How often / How many ... per second.
Does the human eye have a convex lens or a concave lens?
A convex lens.
What do we call the splitting of white light into different individual colours?
Dispersion.
What is an echo? .... echo?
A reflection of a sound wave from a surface.
How fast does light travel?
300 000 000 metres per second