Focus On Life Science: California Grade 7

Lesson 2: Light and Matter

Standards Check

1.
The __________ is an imaginary line perpendicular to the surface of a medium where a wave strikes it. 6.g
A)diffraction grating
B)incidence
C)normal
D)interference
2.
Which of the following best describes why refraction of a wave occurs when the wave travels from one material into another? 6.f
A)The wavelength increases.
B)The speed of the wave changes.
C)The amplitude increases.
D)The frequency decreases.
3.
Reflection occurs when a wave __________ . 6.f
A)strikes an object and bounces off of it
B)compresses air particles as it travels
C)causes ripples in a pool of water
D)bends and changes speeds as it travels
4.
The bending of a light wave as it moves from one medium into another is called __________ . 6.f
A)interference
B)reflection
C)diffraction grating
D)refraction
5.
In which of the following materials will light travel fastest? 6.f
A)water
B)air
C)vacuum
D)glass
Grade 7
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