Explanation:
This problem deals with conversion from Kelvin to celcius scale.
Given that;
Temperature of krypton = 121K
Temperature of Helium = 4K
To convert between kelvin and celcius, we use the expression below;
K = 273 + T°C
Since the unknown is T°C;
T°C = K - 273
For Krypton;
T°C = 121 - 273 = -152°C
For Helium;
T°C = 4 - 273 = -269°C
learn more:
Temperature conversion brainly.com/question/4889772
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i hope i was able to help :)