1) What Planck explained in a formula? a) The light b) His constant, explaining the light radiation emitted from heated bodies c) His constant, explaining a body ´s energy 2) Bohr proposed his quantized shell model of the atom to explain... a) How electrons can have stable orbits around the nucleus b) How protonss can have stable orbits around the nucleus c) How electrons can have unstable orbits around the nucleus 3) When did Planck the introduction of his constant? a) In 1913 b) It doesn´t know c) In 1900 4) When Bohr proposed his quantized shell model of the atom? a) In 1900 b) In 1912 c) In 1913 d) It doesn´t know 5) Why an electron in orbit around an atomic nucleus should emit electromagnetic radiation continously? a) Because it is not continually accelerating b) Because it is continually slowing down c) Because it is continually accelerating and slowing down at the same time in a curved path d) Because it is continually accelerating in a curved path 6) Plank affirmed that energy can be emitted or aboserbed in discrete amounts, and he called this a) how much b) quanta c) He didn´t put a name d) constant 7) Thanks to _________, Bohr obtained a formula for the energy levels of the _______ atom a) Bohr´s constant/oxygen b) Planck´s constant/oxygen c) another formula/hydrogen d) Planck´s constant/hydrogen 8) What Bohr explained in his model? a) He explained how electrons couldn´t jump from one orbit to another only by emitting or absorbing energy in fixed quanta b) He explained how electrons could jump from one orbit to another only by emitting or absorbing energy in fixed quanta c) He explained how protons could jump from one orbit to another only by emitting or absorbing energy in fixed quanta 9) Bohr modified the Rutherford model to... a) remedy the stability problem b) remedy the size and energy of the electrons 10) Bohr modified the Rutherford model by requiring that... a) the protons move in orbits of fixed size and energy b) the electrons move in orbits of fixed size, shape and energy c) the electrons move in orbits of fixed size and energy d) the neutrons move in orbits of fixed size and energy 11) When can radiation occur? a) Only when protons, neutrons and electrons jump from one orbit to another b) Only when the electron jumps from one orbit to another c) Only when an atom jumps from one orbit to another 12) What happen if the radiant energy is less than the quantun of energy? a) That the amount of energy in that frequency reange will be reduced b) That the amount of light in that frequency range will be increased  c) That the amount of energy in that frequency range will be increased d) That the amount of light in that frequency renge will be reduced 13) When a body is heated, its radiant energy in a particular frequency range is... a) not proportional to the temperature of the body b) proportional to the size of the body c) proportional to the temperature of the body 14) The previous answer is according to... a) classical theory b) Bohr´s theory 15) The dimensions of action may be expressed as a) units of light multiplied by time, units of momentum multiplied by length, or units of angular momentum b) units of energy multiplied by time, units of momentum multiplied by length, or units of angular momentum c) units of energy multiplied only by units of angular momentum

Bohr atomic model

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