Answer:17: A wave can be defined as follows: It is important to realize that a wave is quite a different object than a particle. A baseball thrown though a window transfers energy from one point to another, but this involves the movement of a material object between two points.
Explanation:
18: In this way, we classify waves into electromagnetic and mechanical waves. The main difference between mechanical and electromagnetic waves is that electromagnetic waves do not require a medium to propagate whereas mechanical waves require a medium in order to propagate.
Answer:
The time required for light to travel in one year.
Explanation:
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Answer:
The critical angle for the liquid when surrounded by air is 30 degrees.
Explanation:
Given that,
The angle of incidence is 33.5° and the angle of refraction is 19.3°. Firstly, we can find the refractive index of the liquid. It can be calculated using Snell's law as :
The critical angle is given by :
Here, 
is refractive index of air and 
is refractive index of liquid.
So, the critical angle for the liquid when surrounded by air is 30 degrees.
Answer:
The new velocity of the string is 100 centimeters per second (1 meter per second).
Explanation:
The speed of a wave through a string (
), in meters per second, is defined by the following formula:
(1)
Where:
- Tension, in newtons.
- Length of the string, in meters.
- Mass of the string, in kilograms.
The expression for initial and final speeds of the wave are:
Initial speed
(2)
Final speed
(3)
By (2), we conclude that:
If we know that 
, then the new speed of the wave in the string is 
.
1. <span>the low pressure is moving slower than expected.
This make the meteorologist receive premature data which make them fail to interpret the data correctly and make the wronf prediction.
2. Sudden change in wind direction, which transfer the natural occurence into other region than where it initially predicted
3. We still haven't developed the methodology to 100% predict natural occurence</span>
