Making Sound
All sound caused by ?
Something Vibrating
True or False
"Sound need medium to travel"
True
Sound needs medium
How fast does sound travel in air?
Between 330 m/s and 350 m/s
Mention tools that can be used to represent sounds on a display! ( min 1)
A cathode ray
Osiloscope
True or False
"The vibrations always visible"
False
Because they too small or too fast
Sound is an example of a ..... wave
Longitudinal
A reflected of sound is called ?
An Echo
Oscilloscope can be used to observe two important things, those are ...
Amplitude and frequency
Mention example of making sound! ( min 3)
1. Hitting the gong
2. Vocal fold in the Human
3. Hitting the tuning fork
4. Musicl Sound
Sounds wave are vibrations cause by particles moving ....
back and forth
Mention 2 factors that affect speed of sound?
Distance and Time
What does high frequency means?
What does large amplitude means?
high frequency = high pitch
large amplitude = loud sound
Give a simple explanation why we can listen the sound!
The vibrations from the things are passed through the air to our ears where they caused the eardrum to vibrate and we hear sound
Sounds can also travel in liquids. Mention 2 sea animals that use sound to communicate with each other?
Dolphins and Whales
A man blows a whistle and hears the echo from a rock face after 1 seconds. How far away from the rock is he? Assume speed of sound in air = 350 m/s
175 m
Mention the range of frequency for infrasonik, audiosonik, ultrasonik!
Infrasonik = <20Hz
Audiosonik = 20 - 20.000 Hz
Ultrasonik = > 20.000 Hz