Question

Question 10 (1 point)
The table shows the sources and types of energy transmitted for four waves.


Wave Source Type of Energy
W the Sun light
X a dog sound
Y the ocean motion
Z a battery electrical

Which waves are electromagnetic?

a
W and Z
b
W and Y
c
X and Y
d
X and Z
Question 11 (1 point)
What happens when light waves travel from air through a denser medium?

a
They will speed up and bend.
b
They will slow down and bend.
c
They continue to travel in a zigzag line.
d
They continue to travel in a straight line.
Question 12 (1 point)
Colleen replicates an X-ray machine by covering an open shoebox with a screen and positioning a square cardboard piece in the center. She uses sand to simulate X-ray radiation, sprinkling it over the screen. Upon removing the screen, she observes an outline of the square cardboard. What does the cardboard symbolize in her simulation?



a
the areas that remain black on the X-ray
b
the bones that look white in an X-ray
c
the person being scanned with X-rays
d
the veins that look white in an X-ray

Answer 1

Question 10: a — W and Z.
- Light from the Sun is electromagnetic; the electrical wave from a battery is the only other electromagnetic-type option (X and Y are mechanical).

Question 11: b — They will slow down and bend.
- Light entering a denser medium is refracted and travels more slowly.

Question 12: b — the bones that look white in an X-ray.
- The cardboard blocks the "radiation" (sand), like bones block X-rays and appear white on the image.