Question

The headlights are shining on a truck travelling at 100 km/h. The speed of the light from the headlights relative to the road will be:
A) c

B) c + 100 km/h

C) c – 100 km/h

D) depends on the temperature, but faster than the speed if the truck was not moving.

E) faster than if the truck was not moving, but impossible to calculate with the given information

Answer 1

Answer:

A) c

Explanation:

Speed of light is always constant irrespective of the wave source's motion and the observer's inertial frame of reference. So, no matter how fast the car is moving the speed of light will always be constant. The speed of light in air is around 299704644.54 m/s. The meter is also defined by the speed of light as 1 meter is the distance travelled by light in 1/299792458 second.

Answer 2

A, the light generated from the headlights travels at a fixed speed relative to the road