Day 141: How Big is the Sun?

IMAG2116

College-Prep Physics: It was sunny out today! So we poked a hole in the side of a copy paper box to make a pinhole camera. Aimed our cameras at the sun and measured the resulting image in order to determine the true size of the sun. The copy paper box worked beautifully: the sides with the hole and the screen are always parallel; it’s easy to aim the camera directly at the sun — lay box on ground and lift up/turn until box shadow is square; for the size of the box, the image of the sun is exactly 1/2 cm across (so it fits perfectly within 1/2 cm graph paper). We didn’t do anything fancy with foil like I’ve seen for other pinhole cameras on the internet. Should we have? Why?

IMAG2117

Conceptual Physics: Students finished the diode circuit simulation activity from yesterday. One group came up with a possible bike generator circuit that will charge the battery and light the bulb while pedaling, and will also use the battery to light the bulb when the pedaling stops.

Advertisements

Tags: , , , ,

About Frank Noschese

HS Physics Teacher constantly questioning my teaching.

2 responses to “Day 141: How Big is the Sun?”

  1. Brad Wysocki says :

    I’ve used the foil for a pinhole camera as a way to model the particle nature of light. The foil is nice because you can easily change the size and number of holes without ruining the whole box, just a piece of foil. Then we remove the foil, replace and make a new hole. That works pretty well.

    In describing your experiment I don’t see any reason you would need the foil.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: