The argon atom has a collision cross sectional area, σ = 0.36 nm^{2}. Give σ in m^{2}

3.6 ×10^{-8} m^{2}

3.6 ×10^{-10} m^{2}

3.6 ×10^{-19} m^{2}

3.6 ×10^{-17} m^{2}

Convert a frequency of 37 ms^{-1} (per millisecond) to units of ‘per second’, s^{-1}. (Do not confuse ‘per millisecond’, ms^{-1}, with metres per second, m s^{-1}, - note the space between the m and s^{-1})

3.7 ×10^{2} s^{-1}

3.7 ×10^{4} s^{-1}

3.7 ×10^{-2} s^{-1}

37 ×10^{-4} s^{-1}

Which of the following statements is completely true: (Note: 1.0 dm = 0.1 m and 1.0 L = 1000 cm^{3})

A volume of 4.5 dm^{3} is the same as 0.45 L and 450 cm^{3}

A volume of 4.5 dm^{3} is the same as 0.45 L and 4500 cm^{3}

A volume of 4.5 dm^{3} is the same as 4.5×10^{-3} m^{3} and 4.5×10^{3} cm^{3}

A volume of 4.5 dm^{3} is the same as 4.5×10^{-3} m^{3} and 4.5×10^{6} cm^{3}

The density of mercury = 13.6 g cm^{-3}. Give this value in kg m^{-3}

13.6 ×10^{3} kg m^{-3}

1.36 kg m^{-3}

0.136 kg m^{-3}

13.6 ×10^{-3} kg m^{-3}

In the equation,

the units of L are m, and the units of g are m s^{-2}. What are the units of the variable, x ?