1. Microwave ovens, mobile phones, radar
Use this information to decide which set of results were more valid:
A more valid set of results only changes one variable. The results are valid because the experiment is a fair test. If another variable changes, the validity decreases.
Use this information to decide which set of results were more reliable:
A more reliable set of results Have been repeated. The more repeats you do, the more reliable the result becomes.
Use this information to write a definition of an isotope:
Two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
Particle
Mass
Charge
Proton 1 +1
Neutron
None
Electron
1/2000 -1
Use this information to write a description of the electromagnetic spectrum:
The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. The "electromagnetic spectrum" of an object is the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object.
Part of the EM spectrum
Wavelength
Frequency
Sources
Radio waves
 103 metres
  MHz
 AM radio transmitters
Microwaves
 10-2 metres
 1010 Hz
 Microwave ovens, mobile phones, radar
Infra red
 10-5 metres
 1013 Hz
 Remote controls
Visible light
 0.5-6 metres
 1015 Hz
 Light bulbs, the sun
Ultraviolet
 10-8 metres
 1016 Hz
 The sun, black lights
X rays
 10-10 metres
 1018 Hz
 X-ray machines
Gamma rays
 10-12 metres
 1021 Hz
 Radioactive elements
Use this information to describe how DNA can influence characteristics:
In the nucleus the DNA present consists of many base pairs. When mRNA is made by producing a complementary strand, different bases are paired with the DNA strand. Each three bases is known as a triplet. A triplet is the code for one amino acid. Different triplets code for different amino acids. When different amino acids are joined together in the ribosome, a protein is produced. Different proteins contain different amino acids in unique sequences. Because everyone’s DNA is unique, different proteins will be made by everyone. This means that each cell will have individual characteristics. For instance, if someone has DNA that codes for a blue protein, you may have blue eyes. If you have DNA that codes for a brown protein, you may have brown eyes.