Question: Helium gas in an ideal Otto cycle is compressed from 20C and 2.5 to 0.25 L, and its temperature increases by an additional 700C during

Helium gas in an ideal Otto cycle is compressed from 20°C and 2.5 to 0.25 L, and its temperature increases by an additional 700°C during the heat addition process. The temperature of helium before the expansion process is
(a) 1790°C
(b) 2060°C
(c) 1240°C
(d) 620°C
(e) 820°C

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