 of sound it's based on how our brain functions we have come up with different names of what kind of sound it is okay so these are the things which how humans feel about okay so first thing is pitch pitch so basically human brain may not if humans can then that is the pitch so how the brain interprets the frequency of the sound is called pitch the faster the higher is the pitch this is just the definition of pitch what is pitch so you can say what is pitch how the frequency fine so higher is the thing the way it interprets means it is higher pitch okay you can't put a number of it which is equal to 2.5 a number point by its amplitude so basically we are culturally so if amplitude is more it can tends to travel larger distance it doesn't mean that only louder now the way which since he has asked this you're talking about how the oscillation is happening velocity on the medium it is like the thing before your velocity depends on the velocity is lesser than the sound in liquid and you've seen some movies in which people put their ears on the ground to see whether enemies come in which travels from the soil the soil is solid so they're the sound faster if you if they hear from the air that is lower but vibration from the so if you hear some vibration from the earth it means that you know there's something going on very far okay so that's one of the reasons they do and have you with the speed of light please write on em ways it is actually speed of light is like an environment more than this light comes first and then you hear the exact characteristics to distinguish distinguish sound from sound to be soothing and some not so nice one small thing increases when temperature of the medium increases one small thing that we have missed so in the we have learned few the loudness right but they are some of the sound even though it becomes super sound other does not because you bring in the miracle face okay questions could we ask and it can come towards you excited fine so long I think in study I've seen there was a dog which was fighting and his sound used to reflect reflection angle of incidence this is a sphere okay let's say sound is coming in this direction like this angle of incidence and angle of incidence in this guy so you find so this is the angle of incidence in your school exam but just for you to know it doesn't have reflection always it can be any irregular object but still it will follow the law of reflection angle of incidence will be equal to the angle of reflection now can you show me when used by you changed fine so depending on yeah okay so so on say so when when you put sound waves inside the water and comes to you that is moving so you can finally distance as well as what is the velocity of the object towards you with how much frequency it has changed so we learn how to solve problems using this concept of reflection okay so a lot of numericals are there just on the reflection of sounds towards the end so I don't think chapter okay