This is the 5584th most frequent Korean word.
물리학은
"물리학은" means "physics is" or "as for physics."
The term '물리학은' here means 'physics' and is used to introduce the subject of the sentence as the field of study that investigates natural laws.
물리학은 자연의 법칙을 연구하는 학문입니다.
Physics is the study of the laws of nature.
Here, '물리학은' refers to 'physics' in the context of expressing a personal opinion about the subject, namely its difficulty to comprehend.
나는 물리학은 이해하기 어렵다고 생각합니다.
I think physics is hard to understand.
In this sentence, '물리학은' highlights the subject of physics as having significant influence on technological development, showcasing its applicability.