## Reflection: Trust and Respect The Nature of Light: Wave Properties - Section 1: Return to the Electromagnetic Spectrum - Lecture

As I mentioned in the lesson narrative, the relatively long lecture (30 minutes or so) is not my favorite mode of instruction. Students need to be actively involved and, to achieve that, I try to limit my exposition to 20 minutes. I considered breaking up this particular lecture into two segments, interrupted by some practice time. The segments I considered were to be focused on wave interference and the organization of the electromagnetic spectrum, respectively. I decided against that since there was only one practice problem that involved the interference idea and the break, such as it would be, would be short.

As it turned out, the students seemed quite ready to immerse in the "content download" nature of this section. Some reasons for that could possibly be:

- the interactive nature of the interference discussion which broke up the strict teacher-delivery nature of this section,

- the inherent interest in the main kinds of waves presented (sound and light),

- and a carryover effect from the previous class where we catered to a wide variety of student interests in a free-wheeling discussion.

While all of these may have created a greater willingness to be attentive, I think there is one more factor involved. Perhaps having a track record of limiting lecture times to 15-20 minutes created a sense of trust that this would not be the new mode. Indeed, at the beginning of the day, I transparently admitted that we were in an awkward spot thematically - we needed some new information and some new ideas before we could move on in any meaningful way. Perhaps the students' attentiveness was a sign of a shared, positive classroom culture that one would hope to have in place by this time (early February).

The "Long" Lecture
Trust and Respect: The "Long" Lecture

# The Nature of Light: Wave Properties

Unit 4: Electromagnetics
Lesson 5 of 17

## Big Idea: Light, like other electromagnetic phenomenon, can be described by wave properties.

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80 minutes

### Timothy Brennan

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