Question

6.The constant pressure specific heat of an ideal gas is 390 J/kg•K. The molar mass of the gas is 60 g/mol. What is its constant volume molar specific heat?

Group of answer choices

15 J/mol•K

9.0 J/mol•K

21 J/mol•K

27 J/mol•K

7.A heat reservoir at 500 K is in thermal contact with another reservoir at 300 K. If a net 75 kJ of heat is exchanged, what is the change in entropy of the 500 K reservoir?

Group of answer choices

-150 J/K

150 J/K

-250 J/K

250 J/K

-100 J/K

100 J/K

8.A heat pump operates a Carnot cycle extracting heat from a reservoir at 250 K and depositing heat to a reservoir at 300 K. What is its coefficient of performance?

Group of answer choices

3.0

4.0

5.0

6.0

9.Light traveling in water (n = 1.3) reaches an interface with air. At what angle of incidence will there be no light refracted into the air?

Group of answer choices

41°

50°

59°

68°

10.Light is split into two beams that travel along two paths. The path lengths are different by 25 nm. When the light recombines the phase difference is 30°. What is the largest possible wavelength of this light?

Group of answer choices

300 nm

360 nm

420 nm

480 nm

Answer 1