📗 -> 01/16/25: NPB162-L4
🎤 Vocab
❗ Unit and Larger Context
Small summary
✒️ -> Scratch Notes
Active sensory systems are sensory receptors that are activated by probing the environment with self- generated energy.
- Used by bats, dolphins, whales, oilbirds, cave swiftlet, shrew, catfish
Bats produce echolocation by emitting high frequency sound pulses through their mouth or nose and listening to the echo.
Soundwaves
Speed of sound (v): 343 m/sec in air (~1500 m/s)
Sound Frequency (f):
- number of times per second that a sound pressure wave repeats itself.
- units are Hz (cycles / sec)
- number of waves that pass a point per unit time
Wavelength (): The distance between adjacent identical parts of a wave (in time = Period)
- Because bat sounds are much higher frequency than humans (80 kHz > 100 Hz), this allows them to detect much smaller objects (1-2mm compared to ~1m)
🧪 -> Refresh the Info
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🔗 -> Links
Resources
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Connections
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