derivations class 11 chapter1 physical world
Answers
Important Topics for Class 11 Physics Annual Exam 2020 from latest CBSE Class 11 Syllabus & NCERT Textbooks:
Unit I: Physical World and Measurement
Chapter–1: Physical World
⇒Nature of physical laws;
⇒The international system of units
⇒Fundamental forces in nature
Chapter–2: Units and Measurements
⇒ Systems of units
⇒ SI units, fundamental & derived units
⇒ Length, mass & time measurements
⇒ Accuracy vs precision
⇒ Errors in measurement
⇒ Significant figures
⇒ Dimensions of physical quantities
⇒ Dimensional analysis & its applications.
Answer:
In Physics, there are two domains of interest macroscopic and microscopic.
Macroscopic domain: It includes phenomena at the laboratory, terrestrial and astronomical scales.
Microscopic domain: It includes atomic, molecular and nuclear phenomena.
However, recently a third domain of interest between macroscopic domain and microscopic domain (Mesoscopic) has also come in light. In this domain scientists deals with a few tens or hundreds of atoms, has emerged as an exciting field of research.