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# A-Level Question Confusion!

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Why bother with a post grad course - waste of time? 17-10-2016
1. Hey!

I'm having a hard time understanding why these two questions have these answers.

First question deals with pV=nRT so I don't get why pV wouldn't be constant.Second question, I don't get why transverse waves only occur in solids.

1) Consider an isobaric process in ideal gas. Identify the incorrect equation:

- p = const.

- V⁄T = const.

- V1/T1 = V2/T2

- pV = const. (correct)

2) The transverse mechanical wave motion can occur

- only in gases

- only in liquids

- only in solids (correct)

- in gases and liquids

Any help would be appreciated!
2. (Original post by BristolFresher15)
Hey!

I'm having a hard time understanding why these two questions have these answers.

First question deals with pV=nRT so I don't get why pV wouldn't be constant.Second question, I don't get why transverse waves only occur in solids.

1) Consider an isobaric process in ideal gas. Identify the incorrect equation:

- p = const.

- V⁄T = const.

- V1/T1 = V2/T2

- pV = const. (correct)

2) The transverse mechanical wave motion can occur

- only in gases

- only in liquids

- only in solids (correct)

- in gases and liquids

Any help would be appreciated!

First question deals with pV=nRT so I don't get why pV wouldn't be constant.

Explanation: In order for pV to be constant, the number of mole and temperature of the ideal gas needs to be constant. The condition of pV = constant is usually for isothermal process.

Second question, I don't get why transverse waves only occur in solids.

Explanation : Transverse mechanical wave motion needs a restoring force in response to the disturbance in the medium. Solids can have such restoring force.
3. (Original post by Eimmanuel)
First question deals with pV=nRT so I don't get why pV wouldn't be constant.

Explanation: In order for pV to be constant, the number of mole and temperature of the ideal gas needs to be constant. The condition of pV = constant is usually for isothermal process.

Second question, I don't get why transverse waves only occur in solids.

Explanation : Transverse mechanical wave motion needs a restoring force in response to the disturbance in the medium. Solids can have such restoring force.
Thank you!

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