1. ## Wavelength Help Needed

How do I calculate the wavelength of an 1800 MHz signal

2. Velocity, wavelength, and frequency of a wave relate by the following rule:

$v = \lambda f$, where $\lambda$ is the wavelength.

If the wave is a signal, as in radio or television or whatever signal, it is a eletromagnetic wave. Does this ring a bell for you as to the velocity of the wave?

3. Originally Posted by drew1000
How do I calculate the wavelength of an 1800 MHz signal
$\lambda=\frac{c}{v}$ where c=speed of light in a vacuum ( $3 \times 10^8 \ \ m/s \ \ or \ \ 3 \times 10^{10} \ \ cm/s)$ and v = frequency in hertz (hz).

$1800 \ \ Mhz \ \ =1.8 \times 10^9 \ \ hz$

4. What is the answer if it is a mobile phone signal

5. Originally Posted by drew1000
What is the answer if it is a mobile phone signal
A mobile phone signal is a eletromagnetic wave, and as 'masters' correctly pointed out, and all eletromagnetic waves have the speed of light, $c$, in the vacuum. This speed is very similar to that in the air, so you just ignore the difference.