In a Vacuum System,a Container Is Pumped Down to a Pressure

question 46

Multiple Choice

In a vacuum system,a container is pumped down to a pressure of 1.33 $\times$ 10^-6 Pa at 20ºC.How many molecules of gas are there in 1 cm³ of this container? (Boltzmann's constant k = 1.38 $\times$ 10^-23 J/K)

• A)3.3 \(\times\) 10⁸
• B)4.8 \(\times\) 10⁹
• C)3.3 \(\times\) 10¹⁴
• D)7.9 \(\times\) 10¹²
• E)4.8 \(\times\) 10¹²

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Definitions:

Sudden Infant Death Syndrome

Sudden Infant Death Syndrome (SIDS) is the sudden and unexplained death of an apparently healthy infant, often during sleep, and without a clear cause even after a thorough investigation.

Babies

young infants, often referring to those from birth to 12 months, characterized by rapid physical and cognitive development.

Aged

refers to individuals who are significantly above the average human life expectancy, typically those considered elderly or senior citizens.

Sudden Infant Death Syndrome

A sudden and unexplained death of a seemingly healthy baby, often during sleep, affecting infants less than a year old.