Awave's frequency is 2hz and its wavelength is 4 m. what is the wave's speed?

Heat from the sun reaches earth to a. radiation b. convection c. conduction

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

In order of decreasing light-transmitting capabilities of materials, which is the correct sequence? a. transparent -> translucent -> opaque b. opaque -> transparent -> translucent c. opaque -> translucent -> transparent d. translucent -> transparent -> opaque