• The?pitch?of a sound is related to the?frequency?of the vibrating source of sound waves
  • If the?frequency?of vibration is?high, the sound wave has a?high?pitch
  • If the?frequency?of vibration is?low, the sound wave has a?low?pitch

   

The pitch of the sound is related to the frequency of the sound waves

This image shows two sound waves displayed on an oscilloscope. The red wave has smaller wavelength than the blue wave hence it has higher frequency and higher pitch

• The?loudness?of a sound is related to the?amplitude?of the vibrating source of sound waves
  • If the sound is?loud, the sound wave has a?large?amplitude

   

This image shows two sound waves displayed on an oscilloscope. The blue wave has twice the amplitude of the green wave because the blue wave is louder

• The human ear responds to the vibrations caused by sound waves
• The frequency range for human hearing is?20 Hz?to?20 000 Hz

The range of human hearing is between 20 – 20 000 Hz. Below 20 Hz is known as infrasound. Above 20 000 Hz is known as ultrasound

轉載自savemyexam