Physics Worksheet

🌈 Diffraction

Chapter: Waves · Level ★★☆ · Time: 30 min

SCORE___ / 20

NameClassDate

After this worksheet you can

Understand: What is Diffraction?Understand: Diffraction and WavelengthUnderstand: Single-Slit Diffraction PatternUnderstand: Why We Can Hear Around Corners but Not See Around Them

🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4

1Why do radio waves (long wavelength) diffract around hills and buildings more easily than WiFi signals (shorter wavelength)?

2Why does a doorway act as a 'slit' for sound diffraction, letting sound spread out into an adjacent room?

3What happens to a single-slit diffraction pattern's spread if the slit is made narrower?

4Why is diffraction considered strong evidence for the wave nature of light?

🧮 Section B · Problem Solving ● INTERMEDIATE 4 × 3 = 12

5Why can you sometimes see a colorful spread of light when looking at a CD or DVD surface at an angle?

6Would X-rays (very short wavelength) diffract more or less than visible light when passing through the same-sized slit?

7Why is diffraction typically not very noticeable for visible light passing through a normal doorway?

8What does a diffraction grating allow scientists to determine about a light source?

🚀 Section C · Challenge ● CHALLENGE 2 × 2 = 4

9Why does diffraction limit the smallest details a microscope using visible light can resolve?

10Why might engineers use diffraction principles when designing antennas for specific radio frequencies?

💭 Reflection — the most useful thing I learned:

A ___/4 B ___/12 C ___/4 Total ___/20 Teacher's Signature Parent's Signature

✂ answer key — fold or cut before handing out

1 = Longer-wavelength radio waves diffract more readily around obstacles comparable in size to or smaller than their wavelength 2 = The doorway's width is comparable to typical sound wavelengths, causing noticeable diffraction as sound passes through 3 = The pattern spreads out more (wider central band and fringes) 4 = Diffraction (bending around obstacles/through slits) is a distinctly wave-like behavior that simple particle models don't naturally predict | 5 = The closely spaced grooves on the disc act like a diffraction grating, splitting light into its component colors (wavelengths) 6 = Less, since X-rays have an even shorter wavelength relative to the slit size 7 = The doorway is vastly larger than the wavelength of visible light, so diffraction effects are minimal in that situation 8 = Its precise wavelength composition (spectrum), useful for identifying elements or materials | 9 = Light diffracts around structures comparable to or smaller than its wavelength, blurring extremely fine details below that scale 10 = Antenna size relative to the radio wave's wavelength affects how the signal diffracts and propagates, which is critical for effective transmission and reception