Isn-t light supposed to have a constant speed of 3 - 108 m - s - And if it did have different speeds- would it be possible to find its acceleration-

Light travels at speed of 3 × 10^8 m/s only in vacuum. In other media, its speed is always less than 3 × 10^8 m/s. It is impossible to measure the acceleration ...

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Standard XII

Physics

Doppler Effect in Light Waves

Isn't light s...

Question

Isn't light supposed to have a constant speed of $3 \times 10^{8} m / s$ ? And if it did have different speeds, would it be possible to find its acceleration?

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Solution

Light travels at speed of $3 \times 10^{8} m / s$ only in vacuum. In other media, its speed is always less than $3 \times 10^{8} m / s$ .
It is impossible to measure the acceleration that light undergoes. This is because
$a = \frac{Δ v}{Δ t}$
But $Δ t$ in case of light is nearly zero so acceleration is indeterminate.

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Isn't light supposed to have a constant speed of 3×108 m/s? And if it did have different speeds, would it be possible to find its acceleration?

Light travels at speed of 3×108 m/s only in vacuum. In other media, its speed is always less than 3×108 m/s. It is impossible to measure the acceleration that light undergoes. This is because a=ΔvΔt But Δt in case of light is nearly zero so acceleration is indeterminate.

Isn't light supposed to have a constant speed of $3 \times 10^{8} m / s$ ? And if it did have different speeds, would it be possible to find its acceleration?