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

The correct option is A $0.75$ m

$\lambda =\frac{c}{\nu }$

where $\nu$= frequency and $c$= speed of light

$\therefore \lambda =\frac{3\times {10}^8}{400\times {10}^6}$

$\therefore \lambda =0.75m$