# Physics: Post your doubts here!

#### silverr1004

too bad i only saw this after my p3 ended. btw how did you know?
How was your exam for practical? Im taking v2

#### hellodjfos;s'ff

Bro the marking scheme says that A line and a curve should be drawn .. but when I searched the similar solution it said to draw decreasing gradient curve only
Yeah if you follow what I said, you will get a curve exactly like that...

#### Rain0.0

How was your exam for practical? Im taking v2
it was quite okay. how was yours?

#### ZMumin

Someone pls help me with this question
Its AS Level, w15_21 q5

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#### A*****

Plz someone help with this...how is the diagram drawn? It's w18 p51

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#### hellodjfos;s'ff

Plz someone help with this...how is the diagram drawn? It's w18 p51
Large closed container with a beaker containing salt and water solution(placed on a tripod with a fire gauge and bunsen burner beneath it), the large closed container will be connected to a vacuum and a pressure gauge will be placed in the container for pressure readings.

#### A*****

Large closed container with a beaker containing salt and water solution(placed on a tripod with a fire gauge and bunsen burner beneath it), the large closed container will be connected to a vacuum and a pressure gauge will be placed in the container for pressure readings.
Thank you!

#### Hamnah Zahoor

Thanks
A pump should also be placed to vary pressure
How is the pump attached to the apparatus?

#### Kanekii

How is the pump attached to the apparatus?
Instead of adding the tube to a manometer you add it to a pump and a pressure gauge.

#### Hamnah Zahoor

Instead of adding the tube to a manometer you add it to a pump and a pressure gauge.
Thank you

#### A*****

How is the pump attached to the apparatus?
I think it's not important to show the pump specifically, we can just show a tube and write 'to pump' and yes a pressure guage instead of the manometer which will be shown as a circle and labelled. Manometer will also work but then we need to explain it in detail that how value for pressure will be obtained

#### Hamnah Zahoor

I think it's not important to show the pump specifically, we can just show a tube and write 'to pump' and yes a pressure guage instead of the manometer which will be shown as a circle and labelled. Manometer will also work but then we need to explain it in detail that how value for pressure will be obtained
Thank you for your help.

#### A*****

If anyone has drawn diagram for this, plz share

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#### hellodjfos;s'ff

If anyone has drawn diagram for this, plz share
Loudspeaker connected to signal generator and microphone connected to CRO placed infront of the wall. That's about it. Did a free hand drawing so hopefully you get an idea of what it looks like.

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#### A*****

Loudspeaker connected to signal generator and microphone connected to CRO placed infront of the wall. That's about it. Did a free hand drawing so hopefully you get an idea of what it looks like.
And plz tell me how will the intensity be calculated from the amplitude. Amplitude² is proportional to intensity but how will the value be calculated as we don't know of any constant in this equation.
P.s should't the microphone be placed beside the speaker with a barrier in between? And to measure the amplitude of incident wave a cro should also be connected to speaker. Is it so?
This one may sound silly but that's okay Don't we need to give any electricity supply to the microphone?