Question

The MRI (magentic resonance imaging) body scanners used in hospitals operate with 400 MHz radio frequency energy. 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

According to the relation,

$\nu =\frac{c}{\lambda }=\frac{3.0\times {10}^8}{\lambda }$

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

$=\frac{3.0\times {10}^8}{400\times {10}^6}=0.75$ m

Hence, the correct option is $A$