There are two basic ideas in this section energy comes in discrete units called quanta can't measure anything without changing it. The resulting picture is called wave-particle duality. Energy Quantization Consider the first idea here. In the physics section, we saw that atoms could have only certain energies. Energy is said to be quantized .
Light energy is carried in packets called photons.
This is not a significant amount of energy, but if you have 6.022 x 10 of these photons, you would have 200 kJ of energy, which is a significant amount of energy. What it Says Changes caused by the act of measurement make it impossible to know everything about a particle with infinite precision. For example, seeing a book-if you read a page you are seeing light reflected off the page. The book doesn't move because of the reflected light. However, if you want to see an electron, you must use light of very short wavelength to see it.