Wavelength = (speed) / (frequency) =
(299,792,458) / (1,240,000) = 241.768 meters
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Wavelength = (speed) / (frequency) = (340) / (20,000) = 0.017 meter = 1.7 centimeter
There are several kinds of dipole; the most common is the half-wave dipole. Its total length is fairly close to half the wavelength of the design frequency. The length needs to be adjusted slightly to compensate for the thickness of the elements and for end-effects. If the length is wrong by ten or twenty percent it will alter the feed impedance, but have little effect on the gain.
You do not. A metre is a measure of distance, a kiloHertz is a measure of frequency. The two measure different things and it makes no sense to convert from one to the other without additional information - for example: whether you are talking about electromagnetic waves, or sound waves, or waves in the ocean or whatever.
Frequency = 1/period1/7.5 x 10-3 = 1331/3 Hz = 2/15 KHz
0.48 KHz = 480 HzPeriod = 1/frequency = 1/480 = 0.0020833 second (rounded) = 21/12 milliseconds