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00:00:01

[music]

00:00:12

hello, I’m very glad to meet you

00:00:15

at the science lesson, the world of sounds is so

00:00:19

rich in variety, beautiful, diverse,

00:00:23

but we are all tormented by the question of where sounds

00:00:27

come from, that our ears are delighting everywhere, it’s

00:00:31

time to think seriously, we are starting a

00:00:35

new subsection of sound, the topic of our lesson is

00:00:39

how the volume of sound depends on

00:00:43

distance

00:00:44

today in the lesson you will learn what a

00:00:48

sound is, an

00:00:49

echo, how the loudness of a sound depends on the

00:00:53

distance,

00:00:55

find out how the

00:00:58

loudness of a sound is measured, how sound arises and

00:01:01

propagates

00:01:04

before we move on to a new topic, let's

00:01:07

review what we've covered, let's remember and

00:01:11

answer the questions, what is a shadow and a

00:01:16

semi-shadow, a shadow is an area space

00:01:21

into which light does not fall penumbra this

00:01:26

area into which only part of

00:01:29

the light falls the shadow repeats the shape of the object

00:01:34

what the length of the shadow depends on the length of the shadow

00:01:39

depends on the height of the light source what

00:01:44

objects do not transmit light light does not

00:01:47

penetrate through an opaque object but

00:01:51

with a change in the position of the object the

00:01:54

shadow travels together with him, a person

00:01:59

lives in a world of sounds,

00:02:01

sound is what our ear hears, we

00:02:06

hear the voices of people,

00:02:08

birds singing, the sounds of musical

00:02:11

instruments, the

00:02:12

noise of the forest, thunder during a thunderstorm and much

00:02:17

more,

00:02:18

let's look at the

00:02:22

following questions together: what is sound, how the

00:02:27

volume of a sound depends on the distance,

00:02:31

what is it measured in loudness of sound, what is

00:02:35

the speed of sound, how does sound arise and

00:02:39

spread,

00:02:41

what does echo mean, let's

00:02:46

take a closer look and find out what sound is, sound

00:02:52

is a vibration of air that

00:02:55

spreads in the form of waves, upon reaching the ear, the

00:02:59

sound wave

00:03:01

causes the eardrum to vibrate

00:03:03

and the signal is transmitted to the brain and a

00:03:07

person hears the sound, what is it tell the sound

00:03:13

knock rustle shout and ring the

00:03:18

sound try to catch up even if you approach

00:03:22

very carefully you won’t see you won’t find but you

00:03:26

can hear how the volume of a sound

00:03:31

depends on the distance the ear closest to the

00:03:36

source of the sound hears it a little

00:03:40

louder and a little earlier than the other ear

00:03:43

we can hear sounds from behind angle this

00:03:47

is explained by the fact that sound waves

00:03:50

fan out when they pass

00:03:53

through cracks or go around an obstacle;

00:03:56

low sounds

00:03:58

fan out more than

00:04:01

high sounds; the further you are from the

00:04:05

source of sound, the weaker you hear it;

00:04:10

sources of sound are physical bodies

00:04:13

that vibrate, that is, tremble or

00:04:17

vibrate with a frequency of 16 to 20 thousand 1

00:04:23

second in the air, sound travels

00:04:26

in the form of waves, the ear perceives sound

00:04:31

waves passing through the

00:04:34

air around us, sound can

00:04:37

travel in other bases,

00:04:40

as well as in liquids and solids,

00:04:43

so sounds are heard and under water a

00:04:47

vibrating body can be solid

00:04:50

for example, a string is gaseous, for example, a

00:04:54

stream of air,

00:04:56

wind musical instruments, liquid,

00:05:00

for example, waves on water and only in a

00:05:03

vacuum there is no sound, how does sound arise and

00:05:09

spread, sound is transmitted

00:05:13

using sound waves,

00:05:16

they spread from the source of sound,

00:05:19

like a circle of water from a thrown stone,

00:05:23

when a bell rings,

00:05:25

it compresses and decompresses the air At the same time,

00:05:28

layers of air with different pressures appear around you,

00:05:34

this is a sound wave, in which

00:05:40

loudness of sound is measured; sound level meter;

00:05:45

measuring instrument of

00:05:48

sound technology used to determine the level of a

00:05:51

sound signal; sound is measured in

00:05:55

decibels; these are logarithmic units

00:05:58

that well reflect the characteristics of

00:06:02

hearing, since human hearing senses

00:06:06

only relative changes

00:06:08

in acoustic pressure how sound helps to

00:06:14

see some animals use

00:06:17

sound to see for example

00:06:22

bats are able to find their

00:06:25

prey in complete darkness fly at night

00:06:29

without bumping into different objects

00:06:34

using sound to detect

00:06:38

something is called echo locations what

00:06:43

is echo echoes

00:06:45

are sound waves reflected from

00:06:49

objects and returned

00:06:52

back the echo is hiding in the mountains behind the stones

00:06:56

and in the bushes someone will laugh loudly the

00:07:00

echo will immediately respond someone will

00:07:03

scream loudly the echo will not be silent either

00:07:07

remember the human ear is a very

00:07:12

sensitive device,

00:07:13

frequent use of headphones can

00:07:17

lead to hearing impairment did you know

00:07:22

that not all animals hear sounds

00:07:25

as we

00:07:27

interesting facts for example

00:07:31

grasshoppers hear with their paws there are

00:07:35

auditory pits on

00:07:39

their paws making rapid vibrations they find out

00:07:42

where the sound comes from snakes don’t have ears

00:07:47

so they don’t hear sounds that are

00:07:49

transmitted through the air but the media is very

00:07:53

sensitive to earth vibrations the

00:07:57

organ of hearing in a fish is performed by the

00:08:00

swim bladder. This is where our lesson

00:08:04

comes to an end.

00:08:06

Determine what rung of the ladder of

00:08:09

success you are on. I think you were all

00:08:15

very attentive.

00:08:16

Active. I am sure that you are all

00:08:20

on the very top rung of our

00:08:23

ladder.

00:08:25

The results of the lesson today you learned that sound

00:08:30

is vibration air that

00:08:33

spreads in the form of a shaft the volume of

00:08:37

sound is measured in decibels

00:08:39

echo these are sound waves reflected from

00:08:44

objects you will return back figured out

00:08:48

how

00:08:50

sound arises and spreads how the volume of sound depends on the

00:08:54

distance I think that all this

00:08:58

information will help you complete the

00:09:01

following tasks on your own study

00:09:05

and material on the topic of how loud the sound is

00:09:09

depends on distance on pages 143

00:09:14

and 145 do practical work on the

00:09:20

topic sound on pages 146 and 147

00:09:27

thank you everyone see you again in science lessons

00:09:36

[music]

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