## NotTim 3 years ago In a ripple tank, a point on the the third nodal line from the centre is 35.0cm from another. The sources are 11.2cm apart and vibrate in phase at 10.5Hz. Calculate the wavelength and the speed of the waves.

1. NotTim

I haven't done the question. Just wondering what the values correspond with what variables?

2. NotTim

f= 10.5Hz, d=11.2cm, n=3, l=35.0cm. That's what I think. The formulas gunna be tricky too.

3. imranmeah91

each node appear at half a waveleght $35 cm=3 \frac{\lambda}{2}$ $\lambda=35*3/2$

4. Tomas.A

noone answered before because you posted in wrong group

5. imranmeah91

$v= f \lambda$

6. NotTim

Sorry. Came back. How do I post in right group? NEw format messed me up.

7. Tomas.A

it's not new format, just join other group and post there

8. NotTim

ok

9. NotTim

i already joined the physics group. how do i post there.

10. Tomas.A

change your group to physics and same like in this group

11. NotTim

It won't let me change.

12. NotTim

When I look at it, its greyed out.

13. NotTim

The thing I use to use to change the groups.

14. Tomas.A

what you use to change groups?

15. NotTim

The thing under the question box. Where it says Current Group:

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