First slide

Introduction to waves

Question

A micro-wave and an ultrasonic sound wave have the same wavelength. Their frequencies are in the ratio (approximately)

Easy

A

10⁶ : 1
B

10⁴ : 1
C

10² : 1
D

10 : 1

Solution

$n = \frac{v}{λ} \propto v \Rightarrow \frac{n_{MW}}{n_{US}} \approx \frac{3 \times 10^{8}}{3 \times 10^{2}} \approx 10^{6} : 1$

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