q1.
it’s not that the siren changes its tune but it is because of something known as the doppler effect. this is where the sound waves coming from moving objects get squashed or stretched depending on whether something is moving toward or away from you.저기의 where이 왜 들어있는거에요? 앞문장의 doppler effect를 설명하는 내용인데 왜 where이 들어있는지 이해가 안되네요.
위치나 장소를 나타내는 내용도 아니고...q2.
in some ways, this is an amazingly human trait―we are very empathetic creatures.but there are situations [ which /where] that compassion―even for ourselves―might cause problems.which가 안되는건 알겠는데 이것도 마찬가지로 왜 where인가요? 의미상도 맞지 않고..