A beam of light travels at $3 \times 10^{8} m / s$ . If a moped moving at 20.0 m/s turns on its headlight, how fast does the light travel?

20 m / s

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3 \times 10^{8} m / s - 20 m / s

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3 \times 10^{8} m / s

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3 \times 10^{8} m / s + 20 m / s

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Solution

The correct option is B $3 \times 10^{8} m / s$
As, the speed of light is the same for everyone, no matter what velocity they are travelling at.

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Similar questions

A ray of light travelling from medium I in which speed of light is $2 \times 10^{8} m / s$ to a medium II in which speed of light is $1.5 \times 10^{8} m / s$ . Choose the correct ray diagram:

I. $u = 2 \times 10^{8} m / s$

II. $v = 1.5 \times 10^{8} m / s$

The speed of light in air is: (a) $3 \times 10^{8} c m / s$ (b) $3 \times 10^{8} m m / s$ (c) $3 \times 10^{8} k m / s$ (d) $3 \times 10^{8} m / s$

Q. The speed of light in air is 3 × 10⁸ m/s. In medium X its speed is 2 × 10⁸ m/s and in medium Y the speed of light is 2.5 × 10⁸ m/s Calculate:

(a) _air n_x
(b) _air n_Y
(c) _x n_Y

Q. Find out the wavelength of a light wave travelling at

3 \times 10^{8} m / s

has a frequency of

6 \times 10^{15} H z

Q. The speed of light in water is 2.25 × 10⁸ m/s. If the speed of light in vacuum be 3 × 10⁸ m/s, calculate the refractive index of water.

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A beam of light travels at 3×108m/s. If a moped moving at 20.0 m/s turns on its headlight, how fast does the light travel?

The correct option is B 3×108m/sAs, the speed of light is the same for everyone, no matter what velocity they are travelling at.

A beam of light travels at $3 \times 10^{8} m / s$ . If a moped moving at 20.0 m/s turns on its headlight, how fast does the light travel?

The correct option is B $3 \times 10^{8} m / s$
As, the speed of light is the same for everyone, no matter what velocity they are travelling at.