Question

question 1
describe the doppler effect
it is the change in wavelength of radiation due to relative motion of the source with respect to the observer
it is the change in wavelength of radiation due to chemical composition of the source
it is the change in wavelength of radiation due to the temperature of the source
it is an ionization effect
1 pts
question 2
what is the bohr model of the atom
it is a planetary model of the atom but where the electrons can only have certain orbital locations
it describes the atom as a kind of positively charged jelly, with electrons spread throughout
the 4 types of atoms are composed of earth, wind, water and fire.
the bohr atom is an uninteresting type of atom

Explanation:

The Doppler effect is the change in wavelength of radiation due to relative motion between the source and the observer. The Bohr model of the atom is a planetary - like model where electrons can only occupy certain orbital locations.

Answer:

Question 1: It is the change in wavelength of radiation due to relative motion of the source with respect to the observer
Question 2: It is a planetary model of the atom but where the electrons can only have certain orbital locations