Back to the full dot-point answer
QLDPhysicsQuick questions
Unit 2: Linear motion and waves
Quick questions on The wave equation $v = f\lambda$ and applications (QCE Physics Unit 2)
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is mixing up MHz and Hz?Show answer
$96.5$ MHz $= 96.5 \times 10^6$ Hz. Plugging in $96.5$ on its own gives an answer that is off by a factor of one million.
What is forgetting frequency invariance at a boundary?Show answer
If a question asks for the wavelength in glass given the wavelength in air, you usually need to compute frequency from the air values first, then divide the glass speed by that frequency.
What is using $c$ for sound?Show answer
$c = 3.00 \times 10^8$ m s$^{-1}$ is the speed of light. Sound is far slower; use the medium-specific value given in the question.
What is substituting before identifying units?Show answer
Frequency in $1/$ms gives wavelength in mm, not m. Convert before substituting.
What is iA1 data test?Show answer
Often a slinky or oscilloscope stimulus, with a measured period or frequency and a wavelength read off a diagram. Compute speed.
What is eA Paper 1?Show answer
Standard multiple choice: which quantity changes when a wave crosses media (answer: speed and wavelength, not frequency).
What is eA Paper 2?Show answer
Used as a setup for refraction calculations and standing-wave problems in Unit 4 quantum context (where photon wavelength sets ionising potential).
Have a question we have not covered?
This dot-point answer is short enough that we have not extracted many short questions yet. Read the full dot-point answer or ask Mo, our study assistant, in the chat for follow ups.