Question

An electromagnetic wave has a frequency of 150 MHz. Its wavelength in air is approximately:

• A. 0.5 m
• B. 1 m
• C. 2 m
• D. 4 m

Hint:

A useful shortcut when working with electromagnetic waves:
Wavelength in meters is given by:
\[ \lambda\text{ (m)} \approx \frac{300}{\text{Frequency in MHz}} \]
Substituting the given frequency: $\lambda \approx \frac{300}{150} = 2\text{ m}$.
This formula is highly effective for solving RF and antenna questions.

Answer 1

The Correct Option is C

Step 1: Wavelength.
$\lambda = c/f = 3\times10^8/(150\times10^6)$
\[ \boxed{2 \text{ m}} \]