BBC radio presenters have begun their part of a 1,000 mile three-legged challenge for Children in Need (CIN). BBC Radio Cornwall's James Churchfield and James Dundon are each hoping to complete 12.5 ...
Sound vibrations leave the singer's mouth. The higher the pitch of the sound, the higher the frequency, or number of vibrations in a given amount of time. The sound enters the microphone, where it is ...
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