What is the wavelength in free space of a 2 MHz signal?

To find the wavelength of a radio frequency signal in free space, you use the formula: Wavelength (in metres) = 300 / Frequency (in MHz). Here, the number 300 represents the approximate speed of light in free space (300 million metres per second). Plugging 2 MHz into the formula gives the calculation: 300 / 2 = 150 metres. Therefore, a 2 MHz signal has a wavelength of exactly 150 metres. The other options are incorrect mathematical results caused by misapplying the formula, such as multiplying the values instead of dividing, or using 30 instead of 300 as the constant.