5.04 Standard form
Express the following numbers as a basic numeral:
Complete the following equations:
Express the following numbers in standard form:
10^{5} is equal to:
1 million
10 thousand
10 million
100 thousand
Determine whether the following numbers are equivalent to 0.00045:
4.5 \times 10^{ - 4 }
45 \times 10^{ - 4 }
4.5 \times 10^{ - 6 }
0.45 \times 10^{ - 3 }
4.5 \times 10^{ - 3 }
45 \times 10^{ - 5 }
Of the expressions selected in part (a), which one is in standard form?
For each of the following pair of numbers:
State the largest number.
Find the factor by which it is greater.
For each of the following set of numbers:
State the largest number.
State the smallest number.
7.27 \times 10^{ - 7 }
2.22 \times 10^{ - 7 }
4.76 \times 10^{ - 7 }
- 1.25 \times 10^{ - 2 }
- 1.25 \times 10^{ - 6 }
- 1.25 \times 10^{2}
- 9.37 \times 10^{ - 4 }
- 6 \times 10^{ - 4 }
- 6 \times 10^{ - 9 }
- 7.31 \times 10^{ - 9 }
- 5.13 \times 10^{ - 9 }
- 8.31 \times 10^{ - 9 }
- 2.93 \times 10^{ - 2 }
- 7.88 \times 10^{2}
- 7.88 \times 10^{ - 2 }
- 8.99 \times 10^{ - 3 }
- 1.99 \times 10^{ - 6 }
- 8.99 \times 10^{ - 6 }
- 4.7 \times 10^{2} \times 10^{3}
- 4.7 \times 10^{ - 8 } \times 10^{8}
- 4.7 \times 10^{9} \times 10^{8}
- 2.12 \times 10^{ - 1 } \times 10^{7}
- 2.12 \times 10^{ - 7 } \times 10^{4}
- 2.12 \times 10^{7} \times 10^{2}
Evaluate the following, giving your answers in standard form:
A calculator dislays standard form in the form aEb, express the following numbers as a basic numeral:
5.81 E 5
3.16 E \left( - 4 \right)
2.5 E 6
7.05 E \left( - 3 \right)
Use your calculator to find the value of the following:
Use your calculator to evaluate each of the following. Express your answer in standard form, rounded to four significant figures.
A calculator displays 3.35 E 5 as the correct final answer when solving the following problem. Find the missing values in the problem to produce the given answer.
"At any particular time, approximately 2.32 \times 10^{⬚} aircraft are registered as being in flight over ⬚ \times 10^{10} square metres of air space. On average, how much air space does each aircraft have?"
A number is represented in the form 2 E \left( - 6 \right). Which of the following could this number represent?
The mass of an ant in grams
Earth’s population
The distance in kilometres between two planets
The diameter of a human cell
The world's oceans hold approximately 1\,332\,000\,000 cubic kilometres of water.
Bone marrow in a person’s body produces 2.3 \times 10^{6} red blood cells each second.
Which of the following would be the closest rounded value for this number?
20 million each second
2 million each second
2 hundred thousand each second
Hence, estimate the number of red blood cells produced each minute.
The tiny tubes in our kidneys measure about 1.2 \times 10^{ - 5 } metres in diameter.
Which of the following would be the closest rounded value for this number?
1 ten-thousandth of a metre
1 millionth of a metre
1 hundred thousandth of a metre
Hence, estimate the diameter of the tubes in millimetres.
If we round to one significant figure, sound travels at a speed of approximately 0.3 kilometres per second, while light travels at a speed of approximately 300\,000 kilometres per second.
Express the speed of sound in kilometres per second in standard form.
Express the speed of light in kilometres per second in standard form.
How many times faster does light travel than sound?
A country’s land size is approximately 250\,000 square kilometres and its population is approximately 68 million people.
Express the number of square kilometres in standard form.
Express the population in standard form.
Hence, determine the population density measured in persons per square kilometre. Express your answer in standard form.
Consider the following:
- A plane is travelling eight hundred thousand metres per hour.
- An asteroid travelling at 8 \times 10^{8} metres per hour.
Express the speed of the plane in standard form.
How many times faster is the asteroid travelling? Express your answer as a basic numeral.
Two stars, A and B, in neighbouring galaxies have masses of 2.7 \times 10^{41} \text{ kg} and \\ 8.91 \times 10^{44} \text{ kg} respectively. How many times more massive is star B than star A? Express your answer as a basic numeral.
The mass of the largest mammal on Earth is approximately 1.5 \times 10^{3} times greater than the mass of an average adult human who weighs 90 \text{ kg}. According to this information, find the approximate mass of the largest mammal on Earth. Express your answer as a basic numeral.
An insect has an average mass of 0.2 gram. During a plague, it was estimated that there were 100 million insects in a particular area. Find the total mass of insects in standard form.
An estimated 9.1 \times 10^{7} people watched the final of the last World Cup, while an estimated 6.8 \times 10^{7} people watched the final of the World Cup four years before. Find the average number of people who watched the final of the World Cup the last two times it occurred.
Last year, the total \text{CO}_2 emissions of a country was approximately 7 \times 10^{11} \text{ kg} and the country had approximately 3.5 \times 10^{8} citizens. Find the average \text{CO}_2 emissions for each citizen of the country.
The mass of an atom of helium is 6.6465 \times 10^{ - 24 } grams and each litre of helium weighs 145 grams. A balloon is pumped with 11 litres of helium.
Find the number of grams of helium in the balloon.
Find the number of atoms in the balloon. Express your answer in standard form, rounded to one significant figure.
One mole \left(\text{mol}\right) of an element consists of approximately 6.02 \times 10^{23} atoms.
Find the number of atoms in 3.5 \text{ mol} of element X. Express your answer in standard form.
If 3.5 \text{ mol} of element X weighs 31.5 \text{ g}, find the mass of 1 \text{ mol} of element X.
Find the approximate mass of one atom of element X. Express your answer in standard form, rounded to four significant figures.
The Earth orbits the Sun at an approximate speed of 8333 metres per second.
Find how far it travels in one hour. Leave your answer as a basic numeral.
Find how far it travels in 23 hours. Express your answer in standard form, rounded to one significant figure.
Asteroids A and B are currently 4 \times 10^{14} \text{ km} apart. If they continue in a straight line towards one another, travelling at 3857 \text{ km/h} and 7938 \text{ km/h} respectively, how many days will it take for them to collide? Express your answer in standard form, rounded to five significant figures.
Planet A has a radius of 8.2 \times 10^{18} \text{ km}, while planet B has a radius of 4.1 \times 10^{23} \text{ km}. How many times greater than the volume of planet A is the volume of planet B? Express your answer in standard form. The volume of a sphere is given by V = \dfrac{4}{3} \pi r^{3}.