I get confused with the question

[Sanosuke Sagara]

Here's the question,

A half wave dipole aerial is used to receive FM waves of frequency 120MHz.What is the most effective length of the aerial?

(Speed of electromagnetic waves =3.0 x 10^8)


I can't understand with the word 'half wave dipole aerial' ,is that means vibrations in air column,in an open end tube or both end-opened tube ?

wavelength = 3 x 10^8 / (120 x 10^6)
= 0.025m

then I get stuck here,cannot find the lenght.



Can anybody help me ?

[ZapperZ]

Here's the question,

A half wave dipole aerial is used to receive FM waves of frequency 120MHz.What is the most effective length of the aerial?

(Speed of electromagnetic waves =3.0 x 10^8)


I can't understand with the word 'half wave dipole aerial' ,is that means vibrations in air column,in an open end tube or both end-opened tube ?

wavelength = 3 x 10^8 / (120 x 10^6)
= 0.025m

then I get stuck here,cannot find the lenght.



Can anybody help me ?

A half-wave dipole antenna or aerial means that the whole length of the aerial equals to half of the wavelength. This is similar to having a fundamental wavelength in a standing wave air tube with both ends being open.

Zz.