Question

Question 3 (1 point)
Airport security uses electromagnetic waves to see items inside of luggage without having to open the bags. Which type of electromagnetic waves would be best for airport security to use?
a
X-rays would be best because they are low-energy waves that can penetrate gases.
b
X-rays would be best because they are high-energy waves that can penetrate solids.
c
Radar waves would be best because they are low-energy waves that can penetrate gases.
d
Radar waves would be best because they are high-energy waves that can penetrate solids.
Question 4 (1 point)
Pick the three statements that describe convex lenses.

a
They make the image of an object appear larger.
b
They are thicker at the ends than in the middle.
c
Light rays converge as they exit the lens.
d
They are thicker in the middle than at the ends.
e
Light rays spread out as they exit the lens.
f
They make the image of an object appear smaller.
Question 5 (1 point)
Brenna draws two lens models, one of a concave lens and the other of a convex lens. Match the descriptions of her drawings to the lens models they describe.

Column A
1.
The lens is thicker in the middle and thinner on the edges.:
The lens is thicker in the middle and thinner on the edges.
2.
Light rays go through the lens and come together at a point.:
Light rays go through the lens and come together at a point.
3.
The lens is thinner in the middle and thicker on the edges.:
The lens is thinner in the middle and thicker on the edges.
4.
Light rays go through the lens and spread apart.:
Light rays go through the lens and spread apart.
Column B
a.Concave lens model
b.Convex lens model
Question 6 (1 point)
A prism disperses white light, forming a spectrum. Which of the following is the best explanation for this phenomenon?


a
Different frequencies of visible light are absorbed at different rates inside the prism.
b
Different frequencies of visible light move at different speeds in the prism.
c
The white light undergoes partial absorption inside the prism.
d
The white light undergoes partial reflection inside the prism.

Answer 1

Question 3: b — X-rays would be best because they are high-energy waves that can penetrate solids.

Question 4: a, c, d — convex lenses: make images appear larger (often), cause light rays to converge, and are thicker in the middle than at the ends.

Question 5: 1 — b; 2 — b; 3 — a; 4 — a.

Question 6: b — Different frequencies of visible light move at different speeds in the prism (wavelength-dependent refraction), causing dispersion.