Texas TEKS 8.8

8.8 is a TEKS knowledge and skills statement. These are the student expectations under it.

• 8.8.A

  compare the characteristics of amplitude, frequency, and wavelength in transverse waves, including the electromagnetic spectrum

• 8.8.B

  explain the use of electromagnetic waves in applications such as radiation therapy, wireless technologies, fiber optics, microwaves, ultraviolet sterilization, ...

01

What Students Need to Do

Students identify amplitude, wavelength, and frequency on transverse-wave diagrams and compare how these features change. They connect electromagnetic wave types to uses based on energy, penetration, and transmission.

02

What Mastery Looks Like

A student can label wave measurements, rank waves by frequency or wavelength, and explain that frequency and wavelength change in opposite directions. The student can match electromagnetic waves to specific technologies and explain why each type works for that use.

03

Common Misconceptions

Students may measure amplitude from crest to trough instead of from the rest position. They may think frequency and wavelength increase together, or that amplitude determines wave speed. Some assume all electromagnetic radiation is harmful or that sound belongs on the electromagnetic spectrum.

04

How to Assess It

Give students two scaled wave diagrams and ask them to compare amplitude, frequency, and wavelength. Then ask which electromagnetic wave suits fiber optics or sterilization and why.

1. 01

   Use a rope to create waves with different amplitudes and frequencies, then have students measure and sketch each pattern.

2. 02

   Ask students to explain why ultraviolet waves sterilize equipment while X-rays create images inside the body.

3. 03

   Run a card-sort game matching electromagnetic wave types, relative energies, wavelengths, and uses.

4. 04

   Have students inspect a phone, microwave, remote, and fiber-optic cable, then identify the electromagnetic wave used by each.

• 3.8

  Force, motion, and energy. The student knows that energy is everywhere and can be observed in cycles, patterns, and systems. The student is expected to:

• 4.8

  Force, motion, and energy. The student knows that energy is everywhere and can be observed in cycles, patterns, and systems. The student is expected to:

• 6.8

  Force, motion, and energy. The student knows that the total energy in systems is conserved through energy transfers and transformations. The student is expected...

• 6.8.C

  explain how energy is transferred through transverse and longitudinal waves.