Exploring the range of human hearing

• What does the range of human hearing refer to?

  Range of sound frequencies humans can hear
• How is the range of human hearing described?

  As a spectrum of sounds from low to high
• How does the frequency range of hearing differ between children and adults?

  Children hear 20 Hz to 20,000 Hz; adults hear 20 Hz to 16,000 Hz
• What is the relationship between pitch and the shape of the waveform?

  • Lower pitch corresponds to a waveform with a longer wavelength
  • Higher pitch corresponds to a waveform with a shorter wavelength
• If a child can hear frequencies up to 20,000 Hz, what is the minimum frequency they can hear?

  20 Hz
• What is measured in Hertz (Hz) in relation to human hearing?

  The spectrum of sound frequencies perceived by humans
• What happens to adults' ability to hear higher frequencies as they age?

  They may experience a decline in hearing
• What is the frequency range of human hearing?

  20 Hz to 20,000 Hz
• Why can some animals hear sounds that humans cannot?

  They have different hearing ranges
• If a sound is measured at 90dB, how does its intensity compare to an 80dB sound?

  It is ten times more intense
• What is the relationship between sound intensity and amplitude?

  Higher amplitude results in higher sound intensity
• How does age affect hearing range?

  Hearing range decreases with age
• How can the environment affect hearing?

  Prolonged loud noise exposure can damage hearing
• What happens to sounds outside the range of human hearing?

  They are inaudible to humans
• How does the hearing range of dolphins compare to that of humans?

  Dolphins can hear up to $150 \text{kHz}$
• What does sound intensity measure?

  Power of a sound wave per unit area
• What are the frequency ranges for children and adults in human hearing?

  • Children: 20 Hz - 20,000 Hz
  • Adults: 20 Hz - 16,000 Hz
• How does age-related hearing loss affect sound perception?

  High-pitched sounds may be unclear or inaudible
• How does the frequency range of adults compare to that of children?

  Adults have a lower upper limit than children
• What are the hearing ranges of some animals compared to humans?

  • Dolphins: up to 150kHz
  • Bats: up to 120kHz
  • Dogs: up to 50kHz
  • Humans: 20Hz - 20kHz
• How does the waveform change when the pitch is higher?

  • The waveform has a shorter wavelength
  • The frequency of the waveform increases
• If you wanted to produce a higher pitched sound, which of the following would you do?

  Increase the frequency of the waveform
• How do the waveforms differ between the "Lower pitch" and "Higher pitch" graphs?

  • The "Lower pitch" graph has a longer wavelength waveform
  • The "Higher pitch" graph has a shorter wavelength waveform
• Why does the "Louder" graph have a higher amplitude compared to the "Quieter" graph?

  Higher amplitude corresponds to louder sound
• What are frequencies above 20kHz called?

  Ultrasound
• What are the terms for sound frequencies outside the human audible range?

  Ultrasound and infrasound
• In what unit is sound intensity measured?

  Decibels (dB)
• What are the characteristics of normal hearing compared to age-related hearing loss?

  • Hearing Range:
  • Normal: 20 Hz - 20 kHz
  • Age-related: Reduced upper limit (e.g., up to 16 kHz)
  • Sound Perception:
  • Normal: All sounds are clear and easy to hear
  • Age-related: High-pitched sounds may be unclear or inaudible
  • Common Issues:
  • Normal: None
  • Age-related: Difficulty understanding speech in noisy environments
• What are the factors affecting hearing range?

  • Age: Hearing range decreases with age
  • Health: Medical conditions can affect hearing
  • Environment: Loud noises can damage hearing
  • Genetics: Genetic factors may predispose to hearing loss
• What health condition can lead to hearing loss?

  Meniere's disease
• What are frequencies below 20Hz called?

  Infrasound
• What is a common issue faced by individuals with age-related hearing loss?

  Difficulty understanding speech in noisy environments
• What does the logarithmic nature of the decibel scale imply?

  Each 10dB increase is a tenfold intensity increase
• What is the medical term for age-related hearing loss?

  Presbycusis
• What is the definition of hearing range?

  The spectrum of sound frequencies heard
• What is a potential consequence of working in a noisy factory?

  Permanent hearing damage
• What might older adults struggle to hear?

  High-pitched sounds
• What is the relationship between amplitude and loudness in the "Quieter" and "Louder" graphs?

  Amplitude is lower in the "Quieter" graph and higher in the "Louder" graph
• What happens to the upper limit of hearing range with age-related hearing loss?

  It is reduced, e.g., up to 16 kHz
• What is the human audible range of sound frequencies?

  $20 \text{Hz} - 20 \text{kHz}$