A wave has a wavelength of 13 mm and a frequency of 20 hertz. what is it speed?

The largest observatory complex in the world is on Mauna Kea, the tallest mountain on Earth. What are some factors astronomers consider when selecting an observatory site? Don't forget practical ones.

An idea is being proposed. The steps that lead to the idea are listed below. All evidence and arguments were considered. There was peer review. There were different outcomes each time. Can this idea be scientific?

A group of electrons revolving around a nucleus forms an electron

A chair has a mass of 18g and a density of 150 g/m^3

How many millimeters are there in one centimeter

The measure of the distance an object travels in a certain length of time is the object's

A wave is a (blank) that carries (blank) from one place to another

The movement of thermal energy from hot to cold materials is called

A jar contains 30 ml of glycerin and 60 ml of corn syrup which liquid is on the top layer

What are optical fibres