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Standard XII

Physics

The Experimental Setup

Microwaves fr...

Question

Microwaves from a transmitter are directed normally towards a plane reflector. A detector moves along the normal to the reflector. Between positions of $15$ successive maxima the detector travels a distance of $0.14 m$ . The frequency of transmitter is $(c = 3 \times 10^{8} m / s)$ :

$3 \times 10^{10} H z$

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$2 \times 10^{10} H z$

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$1.5 \times 10^{10} H z$

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$3.5 \times 10^{10} H z$

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Solution

The correct option is C
$1.5 \times 10^{10} H z$

The detector receives direct as well as reflected waves. Distance moved between two consecutive position of maxima $= \frac{λ}{2} = \frac{0.14}{14}$ . This gives us $f = \frac{c}{λ} = 1.5 \times 10^{10} H z$

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Q. Microwaves from a transmitter are directed normally towards a plane reflector. A detector moves normal to the reflector and travels a distance of

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Microwaves from a transmitter are directed normally towards a plane reflector. A detector moves along the normal to the reflector. Between positions of 15 successive maxima the detector travels a distance of 0.14 m. The frequency of transmitter is (c=3×108 m/s):

The correct option is C 1.5×1010 Hz The detector receives direct as well as reflected waves. Distance moved between two consecutive position of maxima =λ2=0.1414. This gives us f=cλ=1.5×1010 Hz

Microwaves from a transmitter are directed normally towards a plane reflector. A detector moves along the normal to the reflector. Between positions of $15$ successive maxima the detector travels a distance of $0.14 m$ . The frequency of transmitter is $(c = 3 \times 10^{8} m / s)$ :

The correct option is C
$1.5 \times 10^{10} H z$

The detector receives direct as well as reflected waves. Distance moved between two consecutive position of maxima $= \frac{λ}{2} = \frac{0.14}{14}$ . This gives us $f = \frac{c}{λ} = 1.5 \times 10^{10} H z$