2. all forms of light spread out or ______ in ___ directions. this type of energy can also be called ______ energy.
3. all sources of light require an ______ energy source
- matches use ______ energy (longrightarrow) light energy
- light bulbs use ______ energy (longrightarrow) light energy
4. light energy can be ______ into other types of energy. for example, light energy is transformed into ______ energy when sunlight is absorbed by a black sweater.
5. ______ sources of light have ______ that heat up and glow to produce light (e.g. ______)
6. ______ sources of light have mercury vapour inside which gives off ______ energy. this energy hits the ______ coating and gives off light (e.g. ______)
7. ______ sources of light will glow after holding the material near to a bright light for a while (e.g. ______)
8. a ______ is an example of a chemiluminescent light source because it depends on a ______ ______ in order to give off light.
9. ______ organisms produce light through chemical reactions in their bodies. this type of light source is known as ______
10. how much would it cost to leave a 100 w light bulb on for 5 hours if the cost of lighting is $0.10/kwh? show your work (i.e. convert to kw then to kwh then the total cost)

Question

2. all forms of light spread out or ______ in ___ directions. this type of energy can also be called ______ energy.
3. all sources of light require an ______ energy source
   - matches use ______ energy (longrightarrow) light energy
   - light bulbs use ______ energy (longrightarrow) light energy
4. light energy can be ______ into other types of energy. for example, light energy is transformed into ______ energy when sunlight is absorbed by a black sweater.
5. ______ sources of light have ______ that heat up and glow to produce light (e.g. ______)
6. ______ sources of light have mercury vapour inside which gives off ______ energy. this energy hits the ______ coating and gives off light (e.g. ______)
7. ______ sources of light will glow after holding the material near to a bright light for a while (e.g. ______)
8. a ______ is an example of a chemiluminescent light source because it depends on a ______ ______ in order to give off light.
9. ______ organisms produce light through chemical reactions in their bodies. this type of light source is known as ______
10. how much would it cost to leave a 100 w light bulb on for 5 hours if the cost of lighting is $0.10/kwh? show your work (i.e. convert to kw then to kwh then the total cost)

Accepted Answer

# Explanation:
## Step1: Convert watts to kilowatts
To convert watts to kilowatts, we use the conversion factor $1\,\text{kW} = 1000\,\text{W}$. So, for a $100\,\text{W}$ light bulb, we divide by $1000$:
$100\,\text{W} = \frac{100}{1000}\,\text{kW} = 0.1\,\text{kW}$

## Step2: Calculate energy in kilowatt - hours (kWh)
The formula for energy $E$ (in kWh) is $E = P\times t$, where $P$ is power in kW and $t$ is time in hours. Here, $P = 0.1\,\text{kW}$ and $t = 5\,\text{hours}$.
$E=0.1\,\text{kW}\times5\,\text{h}=0.5\,\text{kWh}$

## Step3: Calculate the total cost
The cost per kWh is $\$0.10$. To find the total cost, we multiply the energy in kWh by the cost per kWh:
$\text{Total Cost}=0.5\,\text{kWh}\times\$0.10/\text{kWh}=\$0.05$

# Answer:
It would cost $\$0.05$ to leave the $100\,\text{W}$ light bulb on for 5 hours.

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QUESTION IMAGE

Question

Explanation:

Step1: Convert watts to kilowatts

Step2: Calculate energy in kilowatt - hours (kWh)

Step3: Calculate the total cost

Answer: