In the world or do you have a list?
Scientists believe that light is made of streams of particles because light exhibits the particle nature. This can be explained on the basis of photoelectric effect observed when light is made to fall on the surface of a metal. when light falls on the surface of a metal, it makes the electron to eject out. This is possible only when light consists of small particle called photons. hence the scientists believe that light is made of streams of particles.
Answer:
B) Faster than before
Explanation:
By the time you begin to wiggle the string more rapidly you are indirectly increasing the number of cycles of the generated wave per second. This means that you are increasing the frequency of the generated wave.
Recall that the frequency of a travelling wave depends on the source of the wave. You generating the wave are the source of the wave.
The general relationship between velocity, frequency and wavelength is given by equation (1);

This shows a linear and direct relationship between velocity v and frequency f. That is to say that when frequency increases, velocity will also increase and vice versa.
As long as other factors such as the tension in the string remains constant, wiggling at a more rapid rate increases the frequency and which also increases the velocity, causing the wave to travel faster than before.
The atmosphere....................................