Question

The MRI (magnetic resonance imaging) body scanners used in hospitals operate with 400 MHz radio frequency. The wavelength corresponding to this radio frequency is

• A. 0.75 m
• B. 0.75 cm
• C. 1.5 m
• D. 2 cm

Answer 1

Answer: (A)

0.75 m

Answer 2

$\lambda = \frac{c}{v} = \frac{3 \times 10^{8}}{400 \times 10^{6}} = 0.7m$