Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Communication

Question:

What is observation that we make when we transmit the following frequencies over an antenna ?

Options:

Length of the antenna increases with increase in frequency of transmission.

Length of the antenna decreases with increase in frequency of transmission.

Length of the antenna is the same for all frequencies.

Length of antenna depends upon the distance of transmission.

Correct Answer:

Length of the antenna decreases with increase in frequency of transmission.

Explanation:

\(\lambda\) = \(\frac{c}{\nu}\)

c = 3 x 108 m/s ; \(\nu\) = 3000 MHz

length of antenna : = \(\frac{\lambda}{4}\) = 0.05 m

 

\(\lambda\) = \(\frac{c}{\nu}\)

c = 3 x 108 m/s ; \(\nu\) = 300 MHz

length of antenna : = \(\frac{\lambda}{4}\) = 0.5 m

 

\(\lambda\) = \(\frac{c}{\nu}\)

c = 3 x 108 m/s ; \(\nu\) = 30 MHz

length of antenna : = \(\frac{\lambda}{4}\) = 5 m

 

Length of the antenna decreases with increase in frequency of transmission.