Apparently the BBC world service is 198LW or 648MW but i always listen to it digitally
It depends where you are in the world. Take a look at this page and you should be able to find out....bbcworldservice/programmeguide/
depends where you are see http://www.bbc.co.uk/worldservice/help/index.shtml#bookmark-2
BBC Radio 4 Longwave usually covers the greater parts of France, Germany, and Holland. Go to 198kHz.
They own sister companies such as BBC films, BBC radio 1extra and so on as well as digital channels BBC 3, BBC 4 which are designed to appeal to a different audience.
A lot. There is: BBC 1, BBC 2, BBC 3, BBC 4, BBC News, BBC Parliament, CBBC, Cbeebies, BBC Iplayer, BBC England, BBC Scotland, BBC Wales, BBC Northern Ireland, and BBC America There is BBC radio channels too: Radio 1, 1Xtra, Radio 2, Radio 3, Radio 4, Radio 5 live,5 live sports extra, 6 music, radio 7, Asian Network
Yes it is.
Yes.
The speed of a wave is the product of its frequency and its wavelength.
1/4 wavelength IF the wave is sinusoidal.
The four basic wave interactions are: wavelength, trough, crest, and amplitude.
If I understand the question correctly, that's one-quarter of a full cycle, so it is 1/4 of the wavelength. The wavelength varies from wave to wave - and this has nothing to do whether the wave is transverse or longitudinal.
If a wave is traveling at 5 meters per second (assuming that is what the question meant) and its wavelength is 20 meters, consider standing beside the wave and watching it pass. As the wave is 20 meters long and it is moving at 5 meters per second, it will take 4 seconds for the full cycle of the wave to pass an observer. That means its frequency is one cycle per 4 seconds. And - surprise! - that's the period of the wave. The period of the wave is 4 seconds.
BBC Radio 4 Longwave usually covers the greater parts of France, Germany, and Holland. Go to 198kHz.
Speed = (frequency) x (wavelength) = 23 x 4 = 92 meters per second
Frequency = (speed)/(wavelength) = (12 cm/sec) / (3 cm) = 4/second = 4 Hz
Speed = (wavelength) x (frequency) = (3 x 4) = 12 meters per second
4 Hz
The speed of the wave is 4x3= 12 meters/second.
We know the formula of speed of a wave is given by V = FW... where V is the speed , F is the frequency and W is the wavelength so very clearly the speed of this wave is 4*3 =12 m/s.