Across
- 2. what is the time taken for the radioactivity of an isotope to half its value called?
- 3. what is a fixed or stationary condition called?
- 7. what is the reduction in the density of something called?
- 10. what is the distance between the crests of a wave in a sound wave or electromagnetic wave called?
Down
- 1. what is the emission of energy as electromagnetic waves called?
- 4. what is the name of the sound waves used for baby scans?
- 5. what is a safety device made of a strip of wire that breaks an electric circuit if the current gets too high called?
- 6. what piece of equipment is used to control heart fibrillation by application of an electric current to the chest?
- 8. what is a positively charged particle consisting of two protons and two neutrons, emitted in radioactive decay called?
- 9. what is the rate per second of a vibration constituting a wave called?