Question
Which part of electromagnetic spectrum is used in satellite communication?
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| S. No. | Wavelength Range |
| $1.$ | $1\ mm$ to $700\ nm$ |
| $2.$ | $400\ nm$ to $1\ nm$ |
| $3.$ | $1\ nm$ to $10^{-3}\ nm$ |
| $4.$ | $< 10^{-3}\ nm$ |