Exploring the Science of Sound: Speed and Mediums

The video explains why we see fireworks before hearing them, due to the speed difference between light and sound. It introduces the bell jar experiment to demonstrate how sound travels through different media: air, water, and solids. The experiment shows that sound requires a medium to travel and cannot move through a vacuum. Sound travels fastest in solids due to tightly packed particles, followed by water, and slowest in air.

Why do we see fireworks before hearing them?

• Because sound travels faster than light

• Because of the distance from the fireworks

• Because light travels faster than sound

• Because fireworks are silent

What happens to the speed of light when it moves from a rarer to a denser medium?

• It remains the same

• It decreases

• It stops completely

• It increases

What is the purpose of the bell jar experiment?

• To show that sound can travel in a vacuum

• To demonstrate that sound needs a medium to travel

• To measure the speed of light

• To create a vacuum for light to travel

What happens to the sound volume when the air volume in the bell jar is reduced?

• The sound volume increases

• The sound volume remains the same

• The sound volume decreases

• The sound volume becomes louder

How does the speed of sound in water compare to that in air?

• It is slower in water

• It is the same in both

• It is faster in water

• It cannot travel in water

In which medium does sound travel the fastest?

• Air

• Water

• Vacuum

• Solid

Why does sound travel faster in solids?

• Because sound does not need a medium in solids

• Because solids are lighter

• Because solids are less dense

• Because particles in solids are tightly packed