Physics - Sound - Sound waves and their properties - Sound Detective

Present 8 sound-related questions. (1) 'Can sound travel in outer space?' (No - no medium!). (2) 'What vibrates when you talk?' (Vocal cords). (3) 'Can you hear a dog whistle?' (No - frequency too high for humans). (4) 'Thunder and lightning happen at the same time. Why do you see lightning first?'