Quantum

Question 1

What did Planck propose

Answer 1

Particles/photons can only have discrete packets of energy/ quanta

Question 2

Unless a particle had enough energy to reach a discrete energy level…

Answer 2

It would remain at its ground state

Question 3

What is the work function

Answer 3

The minimum amount of energy/frequency for an electron needs to be released from the metal surface

Question 4

What were Bohr’s proposals on the model of the hydrogen (4)

Answer 4

The electron in a hydrogen atom has defined energy states - moves from one to the other through absorbing/emitting radiation

Electron revolves around nucleus in circular orbit - electrostatic attraction between proton and electron balanced by potential energy

Only quanta of energy are used - thus concentric orbits

As energy increases by a quantum amount, electron is promoted to higher state - same quanta of energy emitted if electron returns to same state

Question 5

What was he drawback of Bogrs proposals

Answer 5

Electrons move in circular path - creates changing magnetic field

Rotating charge would emit radiation thus orbiting electron would fall into nucleus

Question 6

Anything can have a…

Broglie phenomenon

Answer 6

Wavelength