MHB Secondary 1 Science/Math equation help

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The discussion focuses on solving a secondary school science and math problem related to wave speed and energy transfer. The distance from point A to B is given as 12 meters, equating to 1.5 wavelengths, leading to the conclusion that one wavelength is 8 meters. It is stated that energy transfer from A to B takes 37.5 seconds, allowing for the calculation of wave speed as 0.32 m/s. The time taken for the wave to travel one wavelength is derived to be 25 seconds, confirming the calculations through proportional reasoning. The thread emphasizes understanding wave properties and their relationships in a practical context.
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i am homeschooled and it’d be really helpful if someone can explain the solution for (d): (i) and (ii)
ignore my answer for (a) i know that i should multiply by 2
 

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oops there’s only one wavelength
 
The distance from A to B is 12 m and you are told that this is $1\frac{1}{2}= \frac{3}{2}$ wavelength.
So one wave length is $\frac{1}{\frac{3}{2}}= \frac{2}{3}$ of 12 m= 8 m.
 
part (d) states that it takes 37.5 seconds to transfer energy from A to B, a distance of $1.5 \lambda$

wave speed is $v = \dfrac{12\, m}{37.5 \, sec} = \dfrac{8 \, m}{t \, sec}$ ... solve for $t$

finally, $f = \dfrac{v}{\lambda}$
 
skeeter said:
part (d) states that it takes 37.5 seconds to transfer energy from A to B, a distance of $1.5 \lambda$

wave speed is $v = \dfrac{12\, m}{37.5 \, sec} = \dfrac{8 \, m}{t \, sec}$ ... solve for $t$

finally, $f = \dfrac{v}{\lambda}$
37.5 / 12 x 8 = 2.5s?
or 12 / 37.5 = 0.32
8 / 0.32 = 25s
 
$t = \dfrac{37.5 \cdot 8}{12} = 25 \, sec$

or, thinking proportionally, the wave travels three half wavelengths in 37.5 sec ... it would travel two half wavelengths (1 whole $\lambda$) in 2/3 the time.
 
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