Flashcards
Features of waves
Cards in this deck (11)
- 1What are waves?Waves are vibrations that transfer energy from place to place without matter being transferred.
- 2Which of these cannot travel through a vacuum? Sound Microwaves Radio wavesSound waves require vibrating particles. They cannot travel through a vacuum.
- 3What do we call the height of a wave? Amplitude Frequency WavelengthThe height of a wave is called its amplitude.
- 4What do we measure in hertz in sound waves? Amplitude Frequency WavelengthFrequency is measured in hertz. One hertz is one wave per second.
- 5What describes the spreading out of a wave after it has passed through a gap? Refraction Reflection DiffractionDiffraction is the spreading out of a wave after it passes through a gap. We see this as waves enter harbours.
- 6What size gap causes significant diffraction? A gap that is sized similarly to the wavelength A gap that is a little larger than the wavelength A gap that is much larger than the wavelengthSignificant diffraction occurs when waves pass through a gap that is sized similarly to their wavelength.
- 7What are the units of frequency? Metres Hertz SecondsThe units of frequency are hertz. A frequency of one hertz is one wave per second.
- 8How do we calculate the frequency of a wave? frequency = 1 × time period frequency = distance ÷ time period frequency = 1 ÷ time periodThe correct equation for frequency is one divided by the time period.
- 9What is the period of a wave? The distance it takes to complete one oscillation The time it takes to complete one oscillation The maximum disturbance from its undisturbed pointThe period of a wave is the time it takes to complete one oscillation.
- 10Which of these is not a type of electromagnetic radiation? Infrared waves Sound waves Light wavesSound waves are not a type of electromagnetic radiation. They also travel in waves but not the same type.
- 11What is the wave speed equation? speed = distance ÷ time speed = frequency ÷ wavelength speed = frequency × wavelengthThe correct equation for wave speed is frequency × wavelength. The units are metres per second.