What are three properties of electromagnetic waves? 1. They travel slower than the speed of light, they include visible light waves, and they can transfer energy through empty space.
2. They need matter through which to travel, they travel at the speed of light, and they include visible light waves.
3. They travel at the speed of light, they include ultraviolet waves, and they can transfer energy through empty space.
4. They include ultraviolet waves, they need matter through which to travel, and they travel slower than the speed of light.

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz. what wavelength is produced?

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?