Simple Conversion

Electromagnetic Radiation

Directions:

Answer the following questions:

Note: Please use complete sentences with correct grammar and spelling, where necessary. Proper writing and clarity of thoughts are important in getting full credit. Show all of your work in numbers 6-7.

1. (fill in the blank) The Sun’s temperature is at approximately ________ Kelvin and most of its radiation power and energy fall within the ______________part of the Electromagnetic Spectrum. (2)

2. (fill in the blank) The Earth’s temperature is at approximately ________ Kelvin and most of its radiation power and energy fall within the ______________ part of the electromagnetic spectrum. (2)

3. The temperature of an object goes up by 1 K. How much did it go up in degrees Celsius? How much did it go up in Degrees Fahrenheit? (3)

4. One night you look up in the sky and you see two different color starts next to each other (however many light years away from earth). One star is blue and the other is red. Which star is at a hotter temperature? How do you know? (3)

5.You can dim an incandescent bulb by decreasing the temperature of the filament. What do you think happens to the color of the bulb as it dims? (2)

6. If you leave a 100-W light bulb on for a week, how many joules of energy will be consumed? [hint: it is just a simple conversion] Show your work. (3)

7. How many Joules does 1 regular-size Snickers bar contain? [1 food calorie = 1000 energy calories] Show your work. (3)

8. Why are incandescent light bulbs being phased out in many countries (including the United States)?(3)

9. Your bank account has the same balance on April 1 as it did on March 1. Your friend suggests that this means that you did not deposit or withdraw any money for the entire month. Is that correct? Explain why or why not. (2)

10. List 3 things in your lives that you use every day that require radiation to work. (3)