sound suggested answers

[NE2000]

What was Q4?

It was the one where it asked about the waveform a quarter of a period later. Think B was correct?

[TrueTears]

What was Q4?

It was the one where it asked about the waveform a quarter of a period later. Think B was correct?

Yeah B is right.

[majo]

only lost max 9 marks wooooo

[/0]

Electrons spiralling into the nucleus is a pre-Bohr-ian idea. They thought that as the electron accelerated around the nucleus it would radiate off energy, thus losing energy and spiralling into the nucleus. Bohr fixed this with the energy-level picture of the atom. Unfortunately I don't think Bohr said that electrons would spiral into the nucleus, rather that the electrons wouldn't occupy those energy levels in the first place.
But they important part of your answer is "the wave will cease to exist". After all, your statement "the electron will spiral into the orbit" is a hypothetical. There is no way of knowing what would happen if the electron occupied that energy level simply because it can't. So I think you've got the main points dow and they'll give you the mark for that.

[homghomg1]

Electrons spiralling into the nucleus is a pre-Bohr-ian idea. They thought that as the electron accelerated around the nucleus it would radiate off energy, thus losing energy and spiralling into the nucleus. Bohr fixed this with the energy-level picture of the atom. Unfortunately I don't think Bohr said that electrons would spiral into the nucleus, rather that the electrons wouldn't occupy those energy levels in the first place.
But they important part of your answer is "the wave will cease to exist". After all, your statement "the electron will spiral into the orbit" is a hypothetical. There is no way of knowing what would happen if the electron occupied that energy level simply because it can't. So I think you've got the main points dow and they'll give you the mark for that.

cool thanks

[scope9]

im confused as to where someone has put the answers you're quoting from /O?

[/0]

im confused as to where someone has put the answers you're quoting from /O?

it got moved here
http://vcenotes.com/forum/index.php/topic,19787.msg199845.html#msg199845

[NE2000]

What were q 7 and 8?

So was it 40 m, - 6 dB, 20 phon line?

[appianway]

Pretty sure it was. That sounds familiar

[hauhau]

can someone explain question 11 sound for me? :S

[TrueTears]

can someone explain question 11 sound for me? :S

That was the Pressure vs time graph right?

Well, at P it is always an antinode, thus the pressure goes from high-low-high-low etc

so it must be a sin wave.

Then you look at the period and see which matches the freq given.

[appianway]

Yup. It was option A, I think, if my memory serves me correct.

[hauhau]

>< forgot to look at the frequency. Thanks T.T <-- its u ^^

[TrueTears]

^.^ yeah all I can remember from MC was first 2 was B and last 3 was A hahaha