Bubble + WiFi STEAM Quiz

Question 1

What are bubbles?

Answer 1

Thin films of soap water filled with air that form a sphere shape

Question 2

What does adding soap to bubble mixture do?

Answer 2

Decrease surface tension

Question 3

How are bubbles arranged molecularly?

Answer 3

Soap molecules surround thin layer of water, with hydrophilic heads of soap facing water and hydrophobic tails facing away from water
Water soap sandwich, with water on inside and soap on outside

Question 4

Why are bubbles spherical

Answer 4

Sphere shape minimizes surface area. Spheres have lowest surface are for amount of volume

Question 5

Why are bubbles rainbow/iridescent?

Answer 5

Due to thin-film interference.
Light waves reflect off the inner and outer surfaces of the bubble wall and interfere with each other, creating colorful patterns

Question 6

Creation of bubbles?

Answer 6

3000 BC, Sumerians discovered soap by mxing animal fat and water.
Exact creation and usage of bubbles unknown, but can be estimated through pictures and literature

Question 7

Science of bubbles

Answer 7

Water- water molecules have positive and negative side, causing water molecules to be attracted to each other, which creates surface tension. Surface tension of pure water too high for water alone to form bubbles
Soap-surfactants (hydrophilic head and hydrophobic tail). Arrangment of soap and water reduces water’s surface tension
Reduced tension allows water to stretch into thin-soapy film before popping

Question 8

Physics of Bubbles

Answer 8

Surface Tension-water molecules are polar and attract each other, creating a “skin” at the surface of water that resists being broken. When soap is added to water, surface tension is decreased, allowing bubbles to form
Minimal Surface Area- By forming a sphere, soap file tries to minimize its energy by minimizing its area. This is why bubbles are always round. When bubble come together, they can form more complex shapes, which minimize the total surface area of all the bubbles

Question 9

Chemistry of soap bubbles

Answer 9

Properties of soap- surfactant: lowers surface tension through unique molecular structure , allowing bubble to stretch and hold its shape.
Soap film also slows evaporation of water from the bubble, helping it last longer

Question 10

Colors of Soap Bubbles

Answer 10

Light Reflection and Transmission- light hits bubble and reflects off outer surface or passes through soap film and is reflected off the inner surface
Path Difference-Light that reflects off inner surface has longer path than light reflecting off outer surface, causing them to be out of phase with each other when the meet again outside the bubble
Interference- When two light waves are out of phase, they interfere with each other.
Color Perception- Different colors of light have different wavelengths. Different colors of light undergo interferance at different points, which cause swirling patterns of color to appear on a bubbles surface. These colors change depending on bubble thickness and viewing angle.

Question 11

Soap Bubble Applications

Answer 11

Math and Physics- useful for solving complex math problems involving minimal surfaces. They can also be used to study properties of liquid, gas, and light.
Material Science- bubbles inspire new tech. Iridescent color of bubbles inspired development of photonic crystals which control light flow.
Bio and Medicine- bubbles used to study cell membranes. Also used in bubble CPAP machines for premature babies
Engineering and Industry-used in producction of lightweight material, like foamed concrete andd aerogels
Environmental Science- bubbles used to study air pollution. Bubbles places in polluted environments, bubble residue examined.
Astronomy-Light interference observed in soap bubbles can also be applied to study of astronomical bodies.

Question 12

What is WiFi

Answer 12

Way that devices communicate wirelessly. Comes from router.
Wi-Fi is a wireless networking technology that uses radio waves to allow devices to connect wirlessly

Question 13

2.4 GHz WiFi

Answer 13

Sends small amounts of data over longer distances

Question 14

5 GHz WiFi

Answer 14

Sends large amounts of data over shorter distances faster

Question 15

How do devices connect to WiFi

Answer 15

Network Interface Card- receive and send radiowaves, allowing devices on the same network to communicate
Devices connect to a wireless router using a radio frequency signal instead of wires

Question 16

Difference between WiFi and Internet

Answer 16

WiFi connects devices within a limited range and allows them to communicate.
Internet comes from the modum and internet service provider

Question 17

WiFi alone?

Answer 17

Allows you to communicate with other devices connected to your network

Question 18

WiFi and Modem?

Answer 18

Allows networks to connect to an internet service provider, allowing connectivity to Internet through digital signals

Question 19

What is an internet service provider

Answer 19

Company that provides consumers and businesses with Internet access, making it possible for consumers to surf the web or shop online

Question 20

What does modem do?

Answer 20

A device that connects a homes local network to an Internet Service Provider through a physical connection with a router

Question 21

What does a router do?

Answer 21

A router provides network and is typically connected to a modem. It sends info from the internet to personal devices

Question 22

Devices

Answer 22

Connect to home WiFI, which sends data to router, which is then connected to the Internet through the modem