what does space technology have to do with the 17 sustainable development goals of the united nation ?

What produces light and all other electromagnetic waves? a) the photoelectric phenomena b) heated metals c) charged particles d) radioactive samples (pls explain if you can : )

What is the conversion factor between kg/m^3 and g/m^3. express your experimental values for the densities in kg/m^3.

If a negatively charged particle is placed at rest in an electric potential field that increases in the positive x-direction, what will the particle do? a. accelerate in the positive x-direction b. remain at rest c. accelerate in the negative x-direction