ઓલ ઈન્ડિયા રેડિયો, નવી દિલ્હીનું એક ચોક્કસ સ્ટેશન \(1,368\, \mathrm{kHz}\) \((kilohertz)\) ની આવૃત્તિ પર પ્રસારણ કરે છે. પ્રેષિત્ર (transmitter) વડે ઉત્સર્જિત વિદ્યુતચુંબકીય વિકિરણની તરંગલંબાઈ શોધો. [પ્રકાશનો વેગ \(\left.c=3.0 \times 10^{8}\, \mathrm{~ms}^{-1}\right]\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.