Which type of electromagnetic wave has the longest wavelength

Answer

Using the formula of wavelength

From the above expression, we can see that the wavelength is inversely proportional to frequency.

For wavelength to be the longest frequency should be minimum.

Radio wave has the lowest frequency i.e. 10⁴ so, the wavelength of radio-wave will be maximum.

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.