Turn us on our backs and open our stomachs, and you will be the wisest but at a lummox. what are we?

What type of light does this light bulb produce most (i.e. at what wavelength does the spectrum have maximum intensity)?

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

At what time will the interfering waves have an amplitudeof zero?