Answer:
1. 315.4 K
2. 1560 °C
Explanation:
To convert from celsius to Kelvin, the following formula can be used:
T(K) = T(°C) + 273
Where:
T(K) => Temperature in Kelvin
T(°C) => Temperature in degree celsius
1. Determination of the temperature in Kelvin.
Temperature (T) in °C = 42.4 °C.
Temperature (T) in K =?
T(K) = T(°C) + 273
T(K) = 42.4 °C + 273
T(K) = 315.4 K
2. Determination of the temperature in degree Celsius.
Temperature (T) in K = 1833 K
Temperature (T) in °C =?
T(K) = T(°C) + 273
1833 = T(°C) + 273
Collect like terms
T(°C) = 1833 – 273
T(°C) = 1560 °C
acetic acid is one of popular food preservative so jar A food will not stale as quickly compared to jar B
Half life is the time taken by a radioactive isotope to decay by half its original mass.
The original mass is 200 g
Time taken is 60 hours
Final mass is 25 g
Therefore;
Final mass = Original mass × (1/2)^n; where n is the number of half lives.
25 = 200 (1/2)^n
1/8 = (1/2)^n
n = 3
Three half lives = 60 hours
1 half lives = 20 hours
Therefore; the half life of the radioactive nucleus is 20 hours
