Class 8ScienceSound
Human Ear and Hearing Range
Humans hear 20 Hz to 20,000 Hz (20 kHz). Below 20 Hz: Infrasonic (elephants, earthquakes use this). Above 20,000 Hz: Ultrasonic (bats, dolphins, SONAR, medical imaging โ USG). Ear: Pinna โ Ear canal โ Eardrum (tympanic membrane) โ Ossicles (3 tiny bones: Malleus, Incus, Stapes) โ Cochlea โ Auditory nerve โ Brain.
10 examples
Concept check 1
For Class 8 Science, explain or solve a human ear and hearing range question from the chapter "Sound". Focus on concept check and show the working clearly.
Definition to application 2
For Class 8 Science, explain or solve a human ear and hearing range question from the chapter "Sound". Focus on definition to application and show the working clearly.
Formula warm-up 3
For Class 8 Science, explain or solve a human ear and hearing range question from the chapter "Sound". Focus on formula warm-up and show the working clearly.
Reasoning practice 4
For Class 8 Science, explain or solve a human ear and hearing range question from the chapter "Sound". Focus on reasoning practice and show the working clearly.
Board-style short answer 5
For Class 8 Science, explain or solve a human ear and hearing range question from the chapter "Sound". Focus on board-style short answer and show the working clearly.
Mistake correction 6
For Class 8 Science, explain or solve a human ear and hearing range question from the chapter "Sound". Focus on mistake correction and show the working clearly.
Visual interpretation 7
For Class 8 Science, explain or solve a human ear and hearing range question from the chapter "Sound". Focus on visual interpretation and show the working clearly.
Applied word problem 8
For Class 8 Science, explain or solve a human ear and hearing range question from the chapter "Sound". Focus on applied word problem and show the working clearly.
Revision challenge 9
For Class 8 Science, explain or solve a human ear and hearing range question from the chapter "Sound". Focus on revision challenge and show the working clearly.
Exam recap 10
For Class 8 Science, explain or solve a human ear and hearing range question from the chapter "Sound". Focus on exam recap and show the working clearly.