Microsecond to Century
μs
c
Conversion History
| Conversion | Reuse | Delete |
|---|---|---|
| No conversion history to show. | ||
Quick Reference Table (Microsecond to Century)
| Microsecond (μs) | Century (c) |
|---|---|
| 1 | 0.0000000000000003171 |
| 10 | 0.00000000000000317098 |
| 30 | 0.00000000000000951294 |
| 100 | 0.00000000000003170979 |
| 500 | 0.00000000000015854896 |
| 1,000 | 0.00000000000031709792 |
| 1,000,000 | 0.00000000031709791984 |
About Microsecond (μs)
A microsecond (μs) is one millionth of a second (10⁻⁶ s), the timescale for many electronic and electromechanical processes. A flash of lightning lasts roughly 30 μs. Ultrasound imaging uses pulses in the microsecond range to scan tissue. Camera shutter speeds at 1/1,000,000 of a second are measured in microseconds. CPU cache misses cost tens to hundreds of microseconds in penalty latency. Network round-trip times within a data center are typically 100–500 μs. The microsecond bridges the gap between nanosecond-scale electronics and the millisecond-scale world of human perception.
A lightning stroke lasts about 30 μs. An L1 cache hit on a modern CPU takes ~1 μs. A data center RTT is 100–500 μs.
About Century (c)
A century is exactly one hundred years (3,153,600,000 seconds), the unit of historical timescales. Constitutions, legal codes, and architectural landmarks are described in centuries. The Gregorian calendar century correction rule (century years are only leap years if divisible by 400) reflects the 0.0078-day error that accumulates per century. Sea level rise projections, radioactive decay of long-lived isotopes, and geological processes are measured in centuries or millennia. The Julian calendar drifted roughly 3 days per 400 years, corrected by the century leap-year rule introduced in 1582.
The Eiffel Tower has stood for over a century. Carbon-14 dating is precise to within centuries for samples up to 50,000 years old.
Microsecond – Frequently Asked Questions
How long does a lightning bolt last in microseconds?
The return stroke of a lightning bolt — the bright visible flash — lasts about 30–50 μs. However, a complete lightning discharge consists of multiple return strokes separated by 40–50 ms each, giving a total duration of 0.2–1.0 seconds. The 30 μs flash is so brief it appears instantaneous to human eyes (which require ~100 ms to perceive motion). High-speed cameras at 1,000,000 fps are needed to capture a single return stroke.
What happens in a microsecond inside a computer?
Modern CPUs execute 1,000–5,000 instructions per microsecond at 3–5 GHz with superscalar pipelines. In 1 μs: a CPU can complete a L3 cache hit, begin 5–10 memory transactions, or execute a branch-prediction miss and recover. A database query hitting an in-memory index resolves in ~10 μs. The gap between in-memory operations (~1–100 μs) and disk I/O (~100,000 μs) explains why databases cache hot data aggressively.
Why does ultrasound use microsecond pulses?
Medical ultrasound transmits brief pulses (1–5 μs) of high-frequency sound (1–20 MHz) and then listens for echoes. Sound travels at ~1,540 m/s in tissue, so a 1 μs round trip corresponds to a tissue depth of ~0.77 mm. To image organs at 10–20 cm depth, pulses must be separated by ~130–260 μs. The microsecond pulse width determines axial resolution — shorter pulses resolve finer tissue boundaries.
Is a microsecond relevant to everyday life?
Mostly indirectly — through GPS, WiFi, and Bluetooth. GPS receivers must time signal arrival from four satellites to ~0.1 μs accuracy to compute position to ~30 m precision. WiFi collision avoidance uses random backoff timers measured in μs (the CSMA/CA protocol specifies 20 μs slot times for 802.11). Bluetooth frequency hopping occurs every 625 μs. Everyday life runs on μs-precision electronics without users knowing.
What is the fastest camera shutter speed in μs?
Conventional DSLRs and mirrorless cameras have mechanical shutter speeds down to 1/8000 s = 125 μs. Flash sync at 1/250 s = 4,000 μs limits flash photography. However, electronic shutters in high-speed scientific cameras can achieve 1 μs or below — used to photograph bullets in flight, airbag deployment, and explosive detonations. The fastest streak cameras achieve picosecond-range time resolution for laser physics.
Century – Frequently Asked Questions
What technologies from a century ago were predicted to change the world but failed?
The 1920s confidently predicted personal autogyros (helicopter-planes) would replace cars within decades — they never became practical for commuters. Pneumatic tube mail was expected to connect every home; it peaked in the 1930s and vanished. Radium-infused products (water, toothpaste, suppositories) were marketed as health miracles until people started dying. Moving sidewalks, demonstrated at the 1900 Paris Exposition, were expected to replace urban walking. Airships were the "future of travel" until the Hindenburg (1937). Meanwhile, technologies nobody hyped — antibiotics, containerised shipping, transistors — quietly reshaped civilisation without fanfare.
How accurate is carbon-14 dating in terms of centuries?
Carbon-14 dating (radiocarbon dating) is reliable for organic material up to ~50,000 years (roughly 500 centuries). Precision is typically ±40–200 years for samples from the last 2,000 years, improving to ±centuries for older samples. Calibration against dendrochronology (tree rings) sharpens accuracy significantly. The method measures the decay of ¹⁴C (half-life 5,730 years) — after ~8 half-lives (46,240 years), too little ¹⁴C remains to measure reliably.
What has lasted more than a century that still works today?
The Westinghouse generators installed at Niagara Falls in 1895 ran until 2006 — 111 years. Many Victorian-era water mains and sewer systems in London (built 1858–1875) are still in service. Stradivarius violins from 1700 are still played. The Antikythera mechanism (ancient Greek astronomical computer, ~87 BCE) still demonstrates correct gear ratios. Some Japanese Buddhist temples have been maintained continuously for 14 centuries.
How much sea level rise is projected per century?
IPCC projections (2021) estimate 0.3–1.0 m of sea level rise by 2100 (0–1 century from now) under moderate to high emissions scenarios. Under worst-case scenarios involving ice sheet instability, multi-meter rise within 1–2 centuries is possible. The last time CO₂ was at current levels (around 3 million years ago), sea levels were 15–25 m higher — though the adjustment to that equilibrium takes centuries to millennia.
What institution has existed for more than 10 centuries?
The University of Bologna (founded 1088) is the oldest continuously operating university — now over 9 centuries old. The Papacy has continued as an institution for approximately 20 centuries. The oldest continuously operating business is Kongo Gumi, a Japanese temple builder founded in 578 CE — 14+ centuries, though it was absorbed into a larger company in 2006. The British Crown Jewels include items spanning 10 centuries of continuous use.