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AQA Physics AS exam 24th MAY and 9th JUNE 2016 (Thread) watch

1. (Original post by HasanRaza1)
I measured the length across all three antinodes, which resulted in a length of 11.8cm. That is 0.118m wavelength
Frequency = Speed of light in a vacuo (3x10^8)/Wavelength (0.118)
So f = 2.5x10^9

that's the wavelength for 2 waves isnt it?
2. (Original post by rifat12345)
I think so, 12cm
that'd be 2 wavelengths, so i'm sure it was 6cm?
3. Yeah I agree, I think my worst case scenario was about 50, best about 60
4. Wavelength was 59mm
5. (Original post by musslih)
that's the wavelength for 2 waves isnt it?
Nah, since there were three antinodes so its one complete wave they showed?
6. (Original post by musslih)
What material did you choose for the cable for the lift and the cable/rope for bungee jumping???
B and C

I might be wrong I was just giving BS reasons which were popping in my mind.
7. (Original post by musslih)
that's the wavelength for 2 waves isnt it?
I got 0.118m
8. (Original post by Inam97)
Your right if it was in the fundamental mode of vibration but it had 3 antinodes altogether

Wavelengh= length between a pair of nodes times 2.

But since there was already 2 sets of nodes it was just the whole thing = wavelengh

Again please correct me if am wrong (didn't do that well)
The dots where melting points, if u say it had 3 modes then how can u have melting at centre as there'd be a node at centre therefore no melting
9. (Original post by Inam97)
I think I got 2.71 or something for the a
Its decceleration so its -2.71

You will probz still get full marks for it if its right god willing.
10. I always gave data to 2sf if the data in the question was to 2sf, i didnt give my answers to three sf will I be penalised?
11. (Original post by HasanRaza1)
Nah, since there were three antinodes so its one complete wave they showed?
yeah but the microwave started at the transmitter, not the first node? i'm all ears here
12. (Original post by Kraixo)
Its decceleration so its -2.71

You will probz still get full marks for it if its right god willing.
Oh god no i did that too
13. what did you guys put for percentage change of diameter? i put 3%, but i think it was 20%
14. (Original post by musslih)
that's the wavelength for 2 waves isnt it?
15. (Original post by Kraixo)
Its decceleration so its -2.71

You will probz still get full marks for it if its right god willing.
Not -2.71
16. (Original post by 83457)
yeah but the microwave started at the transmitter, not the first node? i'm all ears here

We have 3 antinodes given to us
One wavelength is the distance from a point on a wave, of given velocity and amplitude, to the adjacent particle on the wave with the same velocity and amplitude

If u look at the diagram the particle motion of the wave at the antinode only reaches the same point by the 3rd antinode

Because of this, the distance across all three antinodes gives 1 wavelength
17. (Original post by HasanRaza1)
Not -2.71
Acceleration is vector so it should be minus 2.71
18. (Original post by HasanRaza1)

We have 3 antinodes given to us
One wavelength is the distance from a point on a wave, of given velocity and amplitude, to the adjacent particle on the wave with the same velocity and amplitude

If u look at the diagram the particle motion of the wave at the antinode only reaches the same point by the 3rd antinode

Because of this, the distance across all three antinodes gives 1 wavelength
so is the distance 0.12 cm or 0.24 cm
19. (Original post by Kraixo)
Acceleration is vector so it should be minus 2.71
In the question they specifically asked for the deceleration
NOT the acceleration, which would be negative

If you decelerate at a rate of -2.7m/s you are accelerating at a rate of 2.7m/s ,i.e. speeding up
20. (Original post by Kraixo)
Acceleration is vector so it should be minus 2.71
But it asked for deceleration, not acceleration.

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