Question

speed of light in vaccum

Answer 1

The speed of light was calculated in vacuum by a Dannish Scientist  Olaus Roemer to be 3×10⁸ m/sec. Or simply 3 lakh kilometres per second.
It is also denoted by c which is constant.

Answer 2

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The speed of light in vaccum is $\sf{3×10^8 m/s}$

Explore more

A vacuum is a volume that encloses little or no matter. In other words, it is a region that has a gaseous pressure much lower than that of atmospheric pressure.

Intensity is the amount of energy a sound wave has per unit of time. Intensity is measured in decibels, represented by dB. Softest sound: 0 dB. Harmful to hearing ≥ 85 dB.

Intensity of sounds

Whisper- 20 dB

Rainfall- 50 dB

Talking normally - 60 dB

Busy city traffic -80 dB

Cheer of crowd at sporting event -90 dB

Headphones at high volume -105 dB

Rock concert - 120 dB