Choose the statement(s) that is/are true about the ratio \frac{c_p}{c_v} c p c v for a gas? (ii) this ratio is the same for all gases. (ii) this ratio has a value 1.67 for a monatomic gas (iii) this ratio has an approximate value of 1.4 for diatomic gases. (iii) this ratio has a value 8.314\: j. mol^{-1}.k^{-1}

(i) false

(ii) true

(iii) true

(iv) false

Explanation:

(i) The ratio of Cp and Cv is not constant for all the gases. It is because the value of cp and Cv is different for monoatomic, diatomic and polyatomic gases.

So, this is false.

(ii) For monoatomic gas

Cp = 5R/2, Cv = 3R/2

So, thier ratio

Cp / Cv = 5 / 3 = 1.67

This statement is true.

(iii) for diatomic gases

Cp = 7R/2, Cv = 5R/2

Cp / Cv = 7 / 5 = 1.4

This statement is true.

(iv) It is false.

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles