Frazer does Physics: 3.7 Using the previous relationships

May 2, 2011

$\mathit{v = f \times \lambda }$

Use the below relationships in different contexts, including sound waves and electromagnetic waves

$\mathit{v = f \lambda }$

$\mathit{f = \frac{1}{T}}$

Examples:

1. A certain sound wave has a frequency of 170 hertz (cycles per second) and a wavelength of 2 metres.

What is the speed of sound?

$\mathit{v = f \times \lambda }$

$\mathit{v = 170 \times 2 }$

$\mathit{v = 340 m/s }$

2. The time period of a waves, T, is the time taken to produce one complete wave.

If the frequency of a wave is 2Hz, what is its time period?

$\mathit{T = \frac{1}{f} }$

$\mathit{T = \frac{1}{2} }$

$\mathit{T = 0.5s }$

Practice makes Perfect.

Frazer does Physics