What factor is responsible for altering the speed of an electromagnetic wave? a) amplitude b) wavelength c) type of medium d) frequency of the wave

The correct answer is "type of medium".

Explanation:

Electromagnetic wave is the wave in which both electric field and the magnetic field are mutually perpendicular each other to the motion of the wave. It travels with the speed of light.

When the electromagnetic wave travels from one medium to the another medium then the speed of the wave will get change and therefore, it changes the wavelength.

Therefore, the type of medium is responsible for altering the speed of an electromagnetic wave.

sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.

i think they are all correct

explanation:

they seem good