Physics · Heat and Thermodynamics
Work through this past-paper style MCQ, then read the full explanation. Practice more physics questions on mMCQ with adaptive practice and topic analytics.
- A2 / 5 R
- B2 / 7 R
- C5 / 2 R
- D7 / 2 R
Since Cp - Cv = Rhence , X - 5/2 R = RX = 7/2 R
This option is incorrect. The specific heat at constant pressure (Cp) is related to the specific heat at constant volume (Cv) by the equation: Cp=Cv+R for an ideal gas. Since Cv= 5/2R, adding R to 5/2R yields 7/2R, not 2/5R.
This option is incorrect. Similar to option A,2/7R is not the correct expression for Cp. The specific heat at constant pressure is always greater than the specific heat at constant volume for an ideal gas due to the energy required to work against the external pressure during expansion.
This option is incorrect because it presents Cp as being equal to Cv. However, Cp is always greater than Cv for an ideal gas due to the energy required to do work against the external pressure during expansion.
This option is correct. The specific heat at constant pressure (Cp) is related to the specific heat at constant volume (Cv) by the equation: Cp=Cv+R for an ideal gas. Since Cv= 5/2R, adding R to 5/2R yields 7/2R, which is correct for this option.
Tagged under Physics · Heat and Thermodynamics · 2018