Dr. Binocs: How You Hear Sound

Which of these sounds can you hear in the early part of Dr Binocs video (Video 2)?

• Hammering a nail.

• Birds chirping.

• People singing.

• Car honking.

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Which range of frequencies can be heard by the human ear?

• 20 - 20 000 Hz

• 10 - 10 000 Hz

• 20 - 200 000 Hz

• 20 - 50 000 Hz

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We hear sounds with our _______________.

• ear

• eye

• nose

• hair

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Which part of the ear receives vibration?

• ear drum

• ear lobe

• ear hairs

• ear mole

What must happen for you to hear sound?

• The sound must be colorful

• The sound must be loud enough and you must be within hearing range

• The sound must be very quiet

• The sound must be made by an animal

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Sounds travels _______________ in solids than in gas.

• faster

• slower

• more

• less

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The drum is hit.

The drum sends vibrations as sound waves.

The ear drum vibrates, activating the hammer, anvil and stirrup.

The cochlea sends the message to the auditory nerve.

The brain hears the sound of the drum.

• and 2

• , 2 and 3

• , 2, 3 and 4

• , 2, 3, 4 and 5

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The hammer, anvil and stirrup are called

• three cool bones

• the ossicles

• the pinna

• very important ear parts

Sound can travel through

• only water

• only air and water

• any solid, liquid or gas

• outer space

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A higher number of decibels means

• the sound is safe and will not damage my ears

• the sound is louder

• you should go up closer

• there is cool technology

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