you could tell this by the redness of the apple and if it is. if it is reddish orange it is not ripe, but is it is just dark red it is ready
No, but the banana affects the apple's ripeness- the APPLE grows quicker. The banana grows normally.
You cannot 'measure' electricity with fruit.
The pH of apples vary depending on the type and ripeness but usually they have a pH around 4.0.
the ripeness of peach makes it much tastier
It varies with variety and ripeness. Eating apples when ripe yield juices in the pH range of about 3.1 to 4.3.
The ripeness of the fruit made it taste so much better! The ripeness of the fruit is what helps me decide which one I would rather buy.
Eat it!
That really depends on what you want to measure about the apple: its weight, mass, diameter, albedo, electrical conductivity, etc.
Ripeness
Ripeness
The Ripeness test is made up of two prongs: 1) Fitness: (concrete and particularized; matured) 2) Hardship: (if no action is taken, will there be significant hardship)
An apple can be measured in inches.... feet I'm not quite sure unless you had the worlds largest apple.