Key LIGHT WORKSHEET

```LIGHT WORKSHEET, WAVELENGTH, FREQUENCY AND ENERGY
Name___________________________ Date___________________ Period_______
Useful Information You May Need:
Red 700 - 650 nm ______________1. Which has the greater blue or indigo light? (blue)
Orange 649 - 580 nm
Yellow 579 - 575 nm
Green 574 - 490 nm ______________2. Which has the greater  red or yellow light? (yellow)
Blue 489 - 455 nm
Indigo 454 - 425 nm ______________3. Which has the greater energy, a photon of yellow
Violet 424 - 400 nm
light or a photon of green light? (green)
______________4. Which has the longer wavelength, light with a frequency of 7.32 X 1014 Hz or light with a
frequency of 6.0 X 1014 Hz? (6.0 X 1014 Hz; it has lower frequency; wavelength and frequency
vary inversely)
______________5. Which has higher energy, of 674 nm or k of 480 nm? (480 nm)
______________6. Which has a higher frequency, orange light or indigo light? (indigo)
______________7. A certain red light has a wavelength of 725 nm and another red light has a frequency of
4.28 X 1014 /sec. Which would have higher energy per photon? (4.28 X 1014/sec; it is shorter)
______________8. Find the color of light whose frequency is 5.21 X 1014 cycles/sec. (yellow)
______________9. What is the frequency of light if its wavelength is 5.4 X 10 -5CM? (5.6 X 1014 Hz)
______________10. Which would have the higher frequency, light of wavelength of 521 nm or light with a
wavelength of 605 nm? (521 nm)
______________11. Which would have the longer wavelength, light with a frequency of 4.5 X 10 14 Hz or light
with a frequency of 6.19 X 1014 Hz? (4.5 X 1014 Hz)
______________12. Find the frequency of light if its wavelength is 7.3 X 10 5 5 picometers. (4.1 X 1014 Hz)
______________13. Find the wavelength in centimeters of light whose frequency is 7.00 X 10 16 Hz.
(4.29 X 10-7- cm)
_______________14. Is the light in # 13 visible? How do you know? (no, 4.29 nm is too short)
_______________15. How many Joules of energy are there in one photon of yellow light whose wavelength
is 630 nm? (3.16 X 10-19 J)
_______________16. Find the color of light whose photon has 4.75 X 10-19 J of energy. (violet)
________________17. Which would have the longer wavelength, a photon with energy of 4.59 X 10-19 J or a
photon with energy of 3.01 X 10-19 J? (3.01 X 10-19 J; less energy means longer waves)
________________18. While doing an experiment in light, Ima Dope finds that the light emitted by his
sample has a frequency of 4.62 X 1016 Hz. Help him by finding the wavelength of
the light and the color (649 nm; orange)
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