Science Y7 Flashcards
(27 cards)
What is a wave?
A wave is a disturbance that transfers energy through matter or space.
True or False: All waves require a medium to travel.
False
What are the two main types of waves?
Mechanical waves and electromagnetic waves.
Fill in the blank: A __________ wave moves in the same direction as the energy transfer.
longitudinal
What is the medium in which sound waves travel?
Air, water, or solid materials.
What is wavelength?
The distance between two consecutive points in phase on a wave.
What is frequency?
The number of waves that pass a given point in one second.
True or False: Higher frequency means shorter wavelength.
True
What unit is frequency measured in?
Hertz (Hz)
What is amplitude?
The maximum displacement of points on a wave from its rest position.
Fill in the blank: Electromagnetic waves do not need a __________ to travel.
medium
What is an example of a mechanical wave?
Sound wave.
What is an example of an electromagnetic wave?
Light wave.
True or False: All waves travel at the same speed.
False
What does the speed of a wave depend on?
The medium through which it travels.
What is reflection in terms of wave behavior?
The bouncing back of a wave when it hits a barrier.
What is refraction?
The bending of a wave as it passes from one medium to another.
Fill in the blank: The __________ of a wave is its height from the rest position.
amplitude
What is diffraction?
The spreading out of waves as they pass through an opening or around obstacles.
What is interference in wave behavior?
The process where two or more waves overlap and combine.
True or False: Constructive interference occurs when waves combine to make a larger wave.
True
What is a standing wave?
A wave that remains in a constant position and does not travel.
What is the formula for wave speed?
Wave speed = frequency × wavelength.
What happens to sound waves as they travel through denser materials?
They typically travel faster.
