Cracking the Mystery of Fermi Numbers - Come Help!

In summary, to determine the number of hairs on your head, you need to measure or estimate the number of hairs per unit area and the surface area of your head with hair. The average diameter of a hair can be used to calculate an upper limit, while estimating the packing density can provide a lower bound. Choosing the mean of these values can give an approximate estimate of the number of hairs on your head.
  • #1
Faiza
96
0
Fermi Numbers!??

I'm trying to solve this problem and explain all my steps in my reasoning.

**HOW MANY HAIRS ARE ON YOUR HEAD?**

If anyone can help me figure this out, reply
thanking u in advance
faiza
 
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  • #2
No Replies :( :'(
 
  • #3
:"( ......
 
  • #4
No of hairs on head is equal to;

No of hairs per unit area x Surface area of head with hair.

You need to get a value for both of these quantities, either through measurement or estimation (or both).

Claude.
 
  • #5
this is hard lol
 
  • #6
Using the average diameter of a hair (about 50 microns, or pluck a few hairs and measure them) you can determine a rough upper limit on the number of hairs. The actual number depends on the packing density, which I think, is not likely less than 10% coverage. So that gives you an approximate lower bound. Pick the mean to get an order of magnitude estimate.
 

Related to Cracking the Mystery of Fermi Numbers - Come Help!

1. What are Fermi numbers?

Fermi numbers, also known as Fermi estimates, are rough calculations used to estimate the order of magnitude of a quantity or measurement. They are named after the physicist Enrico Fermi, who was known for his ability to make quick and accurate estimations.

2. Why is it important to crack the mystery of Fermi numbers?

Cracking the mystery of Fermi numbers can help us improve our critical thinking and problem-solving skills. It can also aid in making accurate estimations in various fields such as science, engineering, and economics.

3. What is the process for cracking the mystery of Fermi numbers?

The process involves breaking down a problem into smaller, more manageable parts, making educated assumptions, and using logical reasoning to arrive at a reasonable estimate. It also involves refining the estimate based on new information or data.

4. Who can participate in "Cracking the Mystery of Fermi Numbers - Come Help!"?

Anyone with an interest in critical thinking and problem-solving can participate in this activity. It is open to students, scientists, and anyone else who wants to improve their Fermi estimating skills.

5. What are some real-world applications of Fermi numbers?

Fermi numbers are widely used in fields such as physics, engineering, economics, and even everyday life. They can be used to make quick estimates of population sizes, energy consumption, and the cost of a project, among many other things.

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