3 years ago

True or false? All waves need a medium in order to travel

2 answers:

4 0

That's false. Mechanical waves (like sound and ocean waves) do
need a medium to travel in, but electromagnetic waves (like radio
and light) don't.

3 0

That is false because electromagnetic waves can travel without a medium.

hope this helps :)

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Alexxandr [17]

Number 4 I think
the atomic mass is 11 because the mass is the sum of protons and neutrons

3 0

2 years ago

hjlf

The object's velocity is decreasing.

Explanation:

From graph is the attached image, we can clearly point that the velocity of this motion is decreasing with time.

Velocity is a vector quantity.

The y-axis represent displacement.
The x-axis depicts time
Using the graph, we know that the slope of the line on the graph gives us the velocity as it denotes the change of displacement with time.
When we find the slope, it will give us a negative value which shows that the body is slowing down and not increasing speed.

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