The relation between the maximum electron density ${N_{{\rm{max}}}}$ and the critical frequency ${f_c}$ for the ionosphere can be given as

${f_c} = 9\sqrt {\;{N_{{\rm{max}}}}} $

${f_c} = \sqrt {9\;{N_{{\rm{max}}}}} $

${f_c} = \sqrt {9\;} {N_{{\rm{max}}}}$

JEE PHYSICS MCQ: COMMUNICATION SYSTEMS

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The relation between the maximum electron density

{N_{\mathrm{max}}}

and the critical frequency

{f_c}

for the ionosphere can be given as

View answer and explanation

Correct option: C

{f_c} = 9\sqrt {\;{N_{\mathrm{max}}}}

Option C (

{f_c} = 9\sqrt {\;{N_{\mathrm{max}}}}

) is correct because it represents the relationship between critical frequency and maximum electron density in the ionosphere.