While standing near a bus stop, a student hears a distant horn beeping. the frequency emitted by the horn is 440 hz. the bus is traveling at 20.0 m/s, and the speed of sound is 330 m/s. what frequency will the student hear at each point in the bus's motion?
a. 468 hz while approaching, 440 hz through the crossing, 415 hz while receding
b. 415 hz while approaching, 440 hz through the crossing, 468 hz while receding
c. 440 hz while approaching, 415 hz through the crossing, 400 hz while receding
d. 505 hz while approaching, 440 hz through the crossing, 438 hz while receding

A. 468 Hz while approaching, 440 Hz through the crossing, 415 Hz while receding

Explanation:

When bus is approaching the stand where boy is standing then the frequency is given as

now we know that

frequency is given by

now plug in the data in the equation

Now when bus is moving away from the bus stop then frequency is given as

so here correct answer would be

A. 468 Hz while approaching, 440 Hz through the crossing, 415 Hz while receding

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.

what question you dont ask a question

explanation: