Explain the theory of Panspermia.

Explain the Darwin’s theory of evolution ‘Natural selection’ with an example?

Explain the Darwin's theory of Natural selection with an example. What do you understand by the term natural selection ? Write drwin's theory of evolution.

Explain the adsorption theory of catalysis with one example.

Explain the adsorption theory of catalysis with one example.

Explain Darwin's theory of Natural Selection with industrial melanism as an experimental proof.

Explain the influence of Planck's quantum theory on Bohr's model of structure of atom.

To explain the nature of radiation, James Clark Maxwell in 1864 put forward .Electromagnetic wave theory.. This theory could explain the phenomena of interference and diffraction but could not explain phenomena of black body radiation and photoelectric effect. Also, after the advent of electromagnetic wave theory, Rutherford.s model of atom suffered a serious drawback. To explain the phenomena of black body radiation and photoelectric effect, Max planck in 1900 put forward Planck.s quantum theory. BAsed on this theory, Neils Bohr in 1913 put forward Bohr.s model of atom which could overcome the drawback of Rutherford.s model and also explain the line spectral elements, especially the line spectra of hydrogen and hydrogen-like particles. Which of the following statements is incorrect about electromagnetic wave theory ?