Solve these clues to fill the grid.
- An empty area or space
- 1 Across
- A quantity that is added
- 5 Across
- Distance travelled per unit time
- 7 Across
- Electronic equipment that provides visual images of varying electrical quantities
- 10 Across
- The property created by the space between two objects or points
- 11 Across
- German physicist who was the first to produce electromagnetic waves artificially
- 13 Across
- The rate at which energy is drawn from a source that produces a flow of electricity in a circuit
- 1 Down
- The snail-shaped tube where sound vibrations are converted into nerve impulses by the organ of Corti
- 2 Down
- Using the reflections of high-frequency sound waves to construct an image of a body organ
- 3 Down
- Electronic equipment that increases strength of signals passing through it
- 4 Down
- The magnitude of sound
- 6 Down
- Device for converting sound waves into electrical energy
- 8 Down
- The number of occurrences within a given time period
- 9 Down
- A measuring instrument that sends out an acoustic pulse in water and measures distances in terms
- 12 Down
- A reply that repeats what has just been said
- 14 Down
- An instance or single occasion for some event
- 15 Down