Answer:
a)
, b)
, c)
, d)
, e)

Step-by-step explanation:
a) The coefficient of performance of the reversible refrigeration cycle is:


The temperature of the hot reservoir is:



b) The coefficient of performance is:


c) The temperature of the hot reservoir can be determined with the help of the following relation:






d) The coefficient of performance is:


e) The temperature of the cold reservoir is:



