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→Example Calculations
===Example Calculations===
====Finding Wave Speed from Wavelength and Frequency====
{| class="wikitable"
| style="height:20px; width:300px; text-align:center;" |QuestionA [[Water Wave|water wave]] has a [[wavelength]] of 1.6m and a frequency of 1.5Hz. Calculate the [[speed]] of the [[wave]].| style="height:20px; width:300px; text-align:center;" |A ray of [[ultravoilet]] [[light]] with a [[frequency]] of 7.5x10<sup>14</sup>Hz and [[wavelength]] of 0.30μm in an [[Optical Fibre|optical fibre]]. Calculate the [[speed]] of the [[wave]] through that [[Optical Fibre|optical fibre]] correct to 2 [[Significant Figures|significant figures]].|-| style="height:20px; width:300px; text-align:left;" |'''1. State the known quantities''' f = 1.5Hz λ = 1.6m| style="height:20px; width:300px; text-align:left;" |'''1. State the known quantities''' f = 7.5x10<sup>14</sup>Hz λ = 0.30μm = 0.30x10<sup>-6</sup>m|-| style="height:20px; width:300px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].''' <math>v = f \lambda</math> <math>v = 1.5 \times 1.6</math> <math>v = 2.4m/s</math> | style="height:20px; width:300px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].''' <math>v = f \lambda</math> <math>v = 7.5 \times 10^14 \times 0.30 \times 10^{-6}</math> <math>v = 225000000m/s</math> <math>v \approx 2.3 \times 10^8 m/s</math>|} ====Finding Wave Speed from Distance Travelled and Time Taken===={| class="wikitable"| style="height:20px; width:300px; text-align:center;" |A scientist [[observe]]s a [[wave]] in a ripple tank. The length of the tank is 0.75m and it takes the [[wave]] 1.2 seconds to get from one end of the tank to the other. Calculate the '''wave speed''' of the [[wave]] correct to two [[Significant Figures|significant figures]].
| style="height:20px; width:300px; text-align:center;" |Question
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| style="height:20px; width:300px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
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