CLASS - XI CHEMISTRY (Structure of Atom) work sheet-3

Topic:-Bohr’s Model of an atom

1. Give the range of wavelength of the visible spectrum.

2. State the two developments that led to the formation of Bohr’s model of atom.

3. What is an electromagnetic radiation?

4. Calculate the wavelength corresponding to a frequency of 98.8MHz.

5. Define black body radiation.

6. Define quantum.

7. Give the relation of energy (E) and frequency (v) as given by Planck.

8. Calculate the frequency and energy of a photon of radiation having
wavelength 3000A

9. What did Planck’s theory explain?

10. On what frequency does the frequency from a black body depend?