Short notes on class 11
chapter 1 physics
Answers
Explanation:
The physical world is referred to the complexity in nature and solving its own complexities will give us new insights into this physical world. It is referred to the analysis of nature conducted in order to understand how the world around us performs.
What are the Fundamental Forces of nature?
In this diverse world, the fundamental forces which govern the phenomena occurring in it are:
Gravitational Force
Electromagnetic Force
Strong Nuclear Force
Weak Nuclear Force
What are the laws of conservation in nature?
The conservation laws in physics are very important when it comes of understanding the subject. The laws are:
Laws of Conservation of Mass
Laws of Conservation of Energy
Laws of Conservation of Momentum
Laws of Conservation of Charge etc
Important Questions
What do you think did Einstein mean when he said: “The most incomprehensible thing about the world is that it is comprehensible”?
“Every great physical theory starts as a heresy and ends as a dogma”. Give some examples from the history of science of the validity of this incisive remark
“Politics is the art of the possible”. Similarly, “Science is the art of the soluble”. Explain this aphorism on the nature and practice of science.
Answer:
Science and its origin
Science is a systematic understanding of natural phenomena in detail so that it can be predicted, controlled and modified. Science involves exploring, experimenting and speculating phenomena happening around us.
The word Science is derived from a latin verb Scientiameaning ‘to know’.
Scientific method is a way to gain knowledge in a systematic and in-depth way. It involves:
Systematic observations
Controlled experiments
Qualitative and Quantitative reasoning
Mathematical modeling
Prediction and verification (or falsification) of theories
Speculation or Prediction
Science does not have any final theory. The improved observations, accurate tools keep improving the knowledge and perspective. Johannes Kepler used Tycho Brahe’s research on planetary motion to improve Nicolas Copernicus theory.
Quantum mechanics was developed to deal with atomic and nuclear phenomena. Work of Ernest Rutherford on nuclear model of atom became basis of quantum theory given by Niels Bohr. Antiparticle theory of Paul Dirac led to the discovery of antielectron (positron) by Carl Anderson.