LIGHT HOMEWORK
1. Rank the following from longest wavelength (1) top shortest (2):
• Visible light
• Radio
• X-Ray
2. Rank the following from highest frequency (1) to lowest (3):
• Ultraviolet
• Microwave
• Gamma ray
3. Rank the following from longest wavelength (1) top shortest (2):
• Green
• Orange
• Red
4. Rank the following from highest frequency (1) to lowest (3):
• Yellow
• Violet
• Blue
5. Complete the following color addition and subtraction problems, using the symbols R, G & B for red,
green and blue:
• Red and blue light both shine on a piece of white paper.
• White light shines on a pigment that absorbs green light.
• White light shines through a yellow filter onto magenta pigment.
6. Certain radio waves have a frequency of 1280 kHz (1280 thousand cycles per second). Calculate the
wavelength of these waves.
7. A certain shade of red light has a wavelength of 685 nm. What is its frequency?
8. The red giant star Betelgeuse gives out more energy at 655 nm than at any other wavelength. What is
this color?
9. A certain color has a frequency of 5.71 x 1014 Hz. What color is this?
10. A 150-watt light bulb has an output of 1730 lumens. What will the light intensity be 4.6 meters away?
11. At a distance of 1.4 meters from a certain light bulb, the intensity is 993 lumens. What is the output of
the bulb in lux?
12. Write out a program in which your robot begins moves forward, checking the light every wheel
rotation. It keeps moving forward if the light is bright, but moves backward if the light is dim.
13. Write out a program that uses the ultrasound sensor to keep your robot following a wall on its left.