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| Frage | Antworten |
| What are waves? | Waves are vibrations that transfer energy from place to place without matter being transferred. |
| Which of these cannot travel through a vacuum? Sound Microwaves Radio waves | Sound waves require vibrating particles. They cannot travel through a vacuum. |
| What do we call the height of a wave? Amplitude Frequency Wavelength | The height of a wave is called its amplitude. |
| What do we measure in hertz in sound waves? Amplitude Frequency Wavelength | Frequency is measured in hertz. One hertz is one wave per second. |
| What describes the spreading out of a wave after it has passed through a gap? Refraction Reflection Diffraction | Diffraction is the spreading out of a wave after it passes through a gap. We see this as waves enter harbours. |
| What 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 wavelength | Significant diffraction occurs when waves pass through a gap that is sized similarly to their wavelength. |
| What are the units of frequency? Metres Hertz Seconds | The units of frequency are hertz. A frequency of one hertz is one wave per second. |
| How do we calculate the frequency of a wave? frequency = 1 × time period frequency = distance ÷ time period frequency = 1 ÷ time period | The correct equation for frequency is one divided by the time period. |
| What 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 point | The period of a wave is the time it takes to complete one oscillation. |
| Which of these is not a type of electromagnetic radiation? Infrared waves Sound waves Light waves | Sound waves are not a type of electromagnetic radiation. They also travel in waves but not the same type. |
| What is the wave speed equation? speed = distance ÷ time speed = frequency ÷ wavelength speed = frequency × wavelength | The correct equation for wave speed is frequency × wavelength. The units are metres per second. |
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