Junior Physics 2021-2022
Unit 7: Characteristics of Light, Reflection and Refraction
7.01 CW: Properties of Light
Name: _____________________________________
Period: ______ Table: ______ Date: _________
Warm-up:
1. Fill in the blanks with your knowledge of unit 6.
2. Given that electromagnetic waves are transverse waves, draw a proper transverse wave and label the following
parts: crest, trough, wavelength, and amplitude.
3. Mathematics of waves:
a. How to calculate the speed of sound if the frequency and wavelength have been given:
b. Based on the equation above, make predictions for the light.
i.
The speed of light remains the same in different media, c = __________ m/s
ii.
With the same speed of light, the light with a higher frequency has a __________ wavelength.
iii.
With the same speed of light, the light with a lower frequency has a __________ wavelength.
4. Electromagnetic Waves in the real world: radiations, lights are examples of electromagnetic waves. Based on the
data below, calculate the frequency or wavelength of each type of electromagnetic wave.
Note: Eyeball the proper locations of each type. Draw a successive wave with appropriate wavelengths in the box below
frequency.
5. Visible light spectrum:
a. Find the frequency of visible light with different colors
Color of Visible Light
Wavelength (nm)
Red
700
Orange
600
Yellow
580
Green
550
Blue
475
Indigo
450
Violet
400
Frequency (Hz)
b. Color and label the Visible light spectrum (wavelength) below.
700 nm
400 nm