16430842
Description
Flashcards by Madison Ellis, updated more than 1 year ago
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Created by Madison Ellis
over 5 years ago
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| Question | Answer |
| Recall one property common among all waves. | All waves transfer energy without transferring matter |
| Define a transverse wave. | In a transverse wave, vibration is at 90° to the direction in which the energy is transferred |
| Define a longitudinal wave. | In a longitudinal wave, vibration is parallel to the direction in which energy is transferred |
| What is amplitude? | Amplitude is the maximum displacement from the point of equilibrium. |
| What is wavelength? | Wavelength is the distance between two points at the same stage in a waves cycle. |
| What is frequency? | Frequency is the number of oscillations per unit time. |
| What is time period in terms of waves? | Time period is the time taken for a wave to complete one cycle. |
| what is the equation for time period? | Time Period = 1/frequency |
| What is the equation for wave speed? | Wave speed = frequency * wavelength |
| What is the audible range? | The audible range is the range of frequencies at which humans can hear sound, usually 20Hz-20kHz. |
| What is Ultrasound? | Ultrasound is sound at frequencies above 20kHz. |
| In sound, how is energy transferred? | In sound, the particles vibrate back and forth and collide with each other, transferring energy. The particles vibrate in the same direction as the energy travels, thus sound is longitudinal. |
| What are the parts to this diagram? | a) Compression b) Rarefaction |
| How do you find the speed of sound in air? | 1) 2 people are places a distance (d) apart 2) one person fires a starters pistol 3) The other measures the time difference (t) 4) speed is calculated by s=d/t |
| How do you measure the speed of water waves? | 1) Measure the time (t) for a set number (N) of waves to pass a point 2) Then find the frequency (f) = N/t 3) Measure the distance between 2 peaks, this is the wavelength (λ) 4) the spped is given by v = fλ |
| what is the calculation for uncertainty? | % uncertainty = (error/measurement) * 100 |
| Describe these uses/advantages of uses of Ultrasound: (i) Communication between animals | Advantages are that animals can communicate without being heard by other animals and navigation via SoN Animals which use ultrasound include Dolphins, bats and mice. |
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