7.1 making and hearing sounds and 7.2 Pitch & frequency

• physics
• Middelbare school
• havo, vwo
• Leerjaar 2

7.1 Making and hearing sounds

      7.2 Pitch and frequency

In a loudspeaker, the part that

vibrates is the cone

in a guitar, the part that

vibrates are the strings

Sound is produced

by vibrations 

in a soundsource

Medium

You can only hear sound when there is a medium to carry it.

Sound can travel through gas, liquids and solids. And even through paint as you can see here.

1. YES, it's possible to hear this
2. NO, it's not possible to hear this

1. YES, it's possible to hear this
2. NO, it's not possible to hear this

1. YES, it's possible to hear this
2. NO, it's not possible to hear this

1. YES, it's possible to hear this
2. NO, it's not possible to hear this

1. YES, it's possible to hear this
2. NO, it's not possible to hear this

1. YES, it's possible to hear this
2. NO, it's not possible to hear this

1. YES, it's possible to hear this
2. NO, it's not possible to hear this

speed of sound

watch the instruction movie.

s = v . t

remember :

v = s/t

t = s/v

homework 7.1

Exercises 1 up untill 12

pitch and frequency

watch the instruction movie.

How many vibrations are there in 1 second? 

frequency = 1 / period

        f = 1 / T

frequency in Herz

  

  

 

frequency range  = the tones that one is able to hear.

human frequency range:

20 hz - 20.000 hz

Rudolph Heinrich Hertz

homework 7.2

summarize 7.2

Exercises 13 up untill 24