13 people killed after a van is driven into crowds in Barcelona. How do we keep our cities safe from these kinds of attacks?
How did referees decide upon the whistle tone they would use to denote the end of the match?
Name: Austin, Reading
Qualification: A-Level Physics
Answer: The whistle is blown at a lower pitch so that the sound can travel further and reach every player, everyone is therefore aware that it has reached the end of the match.