Wave Inteference

Constructive Interference – happens when two waves (either upper or lower) on the same side collide toward each other, and for a moment combine their energy together, usually resulting in higher amplitude or wavelength.

This shows a constructive interference with both waves being on the top side of the medium (slinky), one crest wave to another. For a second, the energy from both waves would collide and combine, making a taller wave, then they would separate and continue down the medium.

Here is supposed to be the same effect as in the video above, but instead the waves are made facing downward. In this case for demonstration, its shown from side to side.

Destructive Interference – is similar to constructive, but instead the waves that are sent through the medium, one is the top (crest), and one is at the bottom (trough). As they collide together, instead of combining, they cancel each other out for a moment then pass through each other and continue down the medium.

Crest vs Trough

Question

How do noise-cancelling headphones use wave interference to eliminate unwanted sound?

With the idea of wave interference, the headphones have a device inside them that would emit small sound waves. As any noise around in generated, a mic on the headphones measure the frequency and wavelength, then using destructive interference, the device inside the cups would create the same waves that would cancel the outside noise.

Physics 11 – Waves

Pulse Wave – is a single wave cause by an event or disturbance that sends energy sent through the medium. They also don’t repeat like a periodic wave.

Periodic Wave – waves caused by repeated events sent constantly in set seconds. If the energy entering the medium stays the same, then the wavelength, height and frequency remains the same each wave.

Longitudinal Wave – the slinky is either pulled or compressed which releases energy going through the slinky in same direction.

Transverse Wave – is a wave create when the medium is pulled side ways, causing the energy to be sent at a right angle of the direction its going. In the video it shows the slinky being pulled up and as it is swayed down, it would send energy right up then back down, continuing through the slinky.

Gene Drive Podcast – Science 10

Podcast Notes

What type of gene mutations did scientists edit?

  • A gene mutation responsible for a heart disease in humans.
  • It involves the gene that develops the heart muscle.

What is a germ line mutation? How many do humans have?

  • Germ line mutations are inherited mutations from one generation that have been past to the next generation.
  • There are various different germ lines (thousands).
  • Because like in DNA between humans, 99.9% of our DNA are similar with 0.1% being the component that makes us unique from each other.

Why do scientists perform gene therapy at the embryotic stage?

“The embryotic stage is the earliest stage to perform the gene therapy before the time of fertilization. Scientists were tasks to access and change the mutation, so they work at this stage because basically when the child is born, the mutation has already been incorporated in the development, so changing every effected cell (which are billions) back to normal is impossible.”

Do you agree with the practice of humans altering genomes of species? Why or why not?

“Well generally, I wouldn’t go for it because DNA is coded instructions for the development of organisms, so it seems like a delicate process to alter and it shouldn’t be messed with. However, of course the purpose of gene therapy research is to find a safe treatment of genetic diseases, so I would only agree to that.”

 

My First Nations Story

This story represents how I came to like reading and how much I learned through that. I read fictional stories, genres like fantasy, sci-fi, with a little comedy and I learned a lot from what is the story based on, how character react to certain events and what was referenced in the story. Even though these stories are fictional, all of them are based of real life experience.