## Lower Secondary Questions

**Beyond PSLE – Lower Secondary Science **

Here’s the kind of question in Lower Secondary Physics that gives students trouble…..

**Question: A helium neon laser produces red light with a wavelength of 633 nanometers. Express the wavelength in micrometers.**

This question requires knowledge of the metric system and how to handle powers of ten. These are both a strong focus of our workshops that we run over the holidays.

For Lower Secondary Science, students need to memorize the Metric System Prefixes. The sooner they master this, the better. Here they are…

A nanometer is a power of ten to -9. That means nine zeros in front of the decimal place. A micrometer is ten to -6. That means six zeros in front of the decimal place. To go from nanometers to micrometers, move the decimal 3 places to the left.

**Answer: 633 nanometers = 0.633 micrometers**

For information on our Holiday workshops and our 2012 Lower Secondary Science Classes, contact us at the link below…..

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