Question

Microwaves from a transmitter are directed normally toward a plane reflector. A detector moves along the normal to the reflector. Between positions of 14 successive maxima the detector travels a distance $0.14m$. The frequency of the transmitter is ($c=3\times {10}^{8}m$ $s^{-1}$)

• A. $1.5\times {10}^{10}Hz$
• B. ${10}^{10}Hz$
• C. $3\times {10}^{10}Hz$
• D. $6\times {10}^{10}Hz$

Answer 1

Answer: (A)

$1.5\times {10}^{10}Hz$

wavelength is $\frac{0.14}{7}=0.02m$
$frequency=\frac{3\times {10}^8}{0.02}=1.5\times {10}^{10}$
option $A$ is correct