Free Printable WorksheetScienceGrade 9Science CurriculumNGSS HS-PS4-1, HS-PS4-3

9.78 Interference and Diffraction Basics Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Physical Science with Earth and Science Science worksheet provides structured practice on 9.78 Interference and Diffraction Basics. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Interference and Diffraction Basics: MCQ focus: identify wave interactions such as constructive interference, destructive interference, and spreading around barriers. Aligned to NGSS high school Physical Science, Earth and Space Science, and Engineering Design; NRC/DCI; SEP/CCC; CCSS math/literacy connections; selected CA NGSS, NYSSLS, Florida CPALMS, and Texas TEKS references NGSS HS-PS4-1, HS-PS4-3 - NGSS-aligned Interference and Diffraction Basics: NGSS: HS-PS4-1; HS-PS4-3; NRC/DCI: PS4.A-B; SEP/CCC: Models / Patterns; Common: RST.9-10.7; State refs: CA/NYSSLS same HS-PS PE family; FL SC.912.P.10; TX IPC energy strand.

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Physical Science with Earth and Science

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 9.78 Interference and Diffraction Basics skill assessments:

Problem 1Difficulty: Mastery

Two in-phase sound sources create a loud maximum at point P when the path difference is one wavelength. A listener moves so the path difference becomes 1.5 wavelengths. What change should the listener expect?

AThe sound should remain a loud maximum because any nonzero path difference is constructive.

BThe sound should become visible light because the path difference changed.

CThe sound should shift toward a quiet minimum because the waves become out of phase.

DThe sound should stop diffracting because the listener moved.

Solution & Explanation:One wavelength gives constructive interference, but 1.5 wavelengths is a half-integer difference that gives destructive interference.

Problem 2Difficulty: Mastery

A two-slit water-wave setup shows waves spreading from each slit and then forming alternating high- and low-amplitude bands. Which explanation is most complete?

AAbsorption at the screen creates all high-amplitude bands.

BDiffraction at the slits creates spreading waves, and interference between those waves creates the bands.

CInterference at the slits prevents waves from spreading.

DDiffraction alone creates the bands without any wave overlap.

Solution & Explanation:The slits first produce diffracted spreading waves. Where those waves overlap, constructive and destructive interference form the pattern.

Problem 3Difficulty: Mastery

Microwave radiation has wavelengths of centimeters, while visible light has wavelengths much smaller than everyday objects. Why can microwaves diffract around building edges more noticeably than visible light?

AVisible light cannot diffract under any conditions.

BMicrowave wavelengths are more comparable to the size of the edges and openings.

CMicrowaves have no frequency, so they bend around all objects.

DMicrowaves diffract because they are not electromagnetic waves.

Solution & Explanation:Diffraction is more noticeable when wavelength is comparable to the size of an obstacle or opening. Microwaves have much longer wavelengths than visible light.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Physical Science with Earth and Science Science students. It aligns with educational standard NGSS HS-PS4-1, HS-PS4-3 (NGSS: HS-PS4-1; HS-PS4-3; NRC/DCI: PS4.A-B; SEP/CCC: Models / Patterns; Common: RST.9-10.7; State refs: CA/NYSSLS same HS-PS PE family; FL SC.912.P.10; TX IPC energy strand.).