9th k12 gca light test review sheet for physics! 100
1. the electromagnetic spectrum

give the em spectrum in order from longest to shortest wavelength:

1.

2.

3.

4.

5.

6.

7.

is the order of waves from lowest to highest frequency or highest to lowest frequency?

is the order from lowest to highest energy or highest to lowest energy?

is the order from least to most penetrating or most to least penetrating?

2. given what you wrote in one,
radio waves have the wavelength and the frequency and therefore the energy and the ability to penetrate.

gamma rays have the wavelength and the frequency and therefore the energy and the ability to penetrate.

3. check all that apply. which is true?
 frequency is directly related to speed
 frequency is inversely related to wavelength
 wavelength is directly related to speed

4. check all that apply. electromagnetic waves:

 are mechanical waves
 are electromagnetic
 are transverse waves
 are longitudinal (pressure) waves
 move perpendicular
 move parallel
 require a medium
 travel through a vacuum
 transfer energy

5. match the wave on the left with one of its uses on the right.

a. gamma ray

b. infrared

c. radio

d. x-ray

6. in the image below, identify the incident ray and the reflected ray. what do we know about these rays?
a. they are always equal.
b. the incident ray is always bigger.
c. the reflected ray is always bigger.
d. either the incident ray or the reflected ray can be bigger based on the angle of reflection.

7. the image below shows the visible spectrum. red is on the far left because it has the ( smallest / largest ) wavelength. whereas, violet is on the far right because it has the ( smallest / largest ) wavelength.

8. a leaf appears green because the leaf ( reflects / absorbs ) the green wavelengths of light. the light that is reflected are the ones we ( see / do not see ) and wavelengths that are absorbed we ( see / do not see ).

9. in the summer we avoid wearing black and walking on dark surfaces like roads. geenrally, we wear light or white clothing as well. why?

10. first complete the definition and then find or draw an image for each of the terms below.

reflection: when light rays…

refraction: when light rays…

diffraction: when light rays…

opaque object: objects that….

translucent object: objects that….

transparent object: objects that….