Waves, Sound and light 1차 미션

미르나래
|
2012-12-24

This is the science part of your homework, the literature part already having been given. I only hope that you will not neglect science in your search for knowledge.For it is the best diion of the known world. If I may explain myself for my reprochable opinion, I'll say that the way of people are due to evolution. People who are un-generous are partly the result of evolution, in order to survive you have to be able to say, THIS IS MY FOOD. Wouldn't you agree? The self-lessness is due to our having so plenty. It is actually a kind of defect. And I guess you have played with a ball before? The ball goes up, but it gradually comes back down. That is because the gravitational field of the earth pulls it down. All the every day things (as you can see) are related to science. That is the reason for my recommendation of the study of it. Now to go straight to the homework.

Waves, Sound and light 1.1 Waves transfer energy 1.2 Waves have measurable properties (6~23page)

This is the amount you have to read till 1/6.

There are some questions I want you to think about below.

Q1. What do you think will happen to a water wave when the depth of the water decreases?

What will happen to the amplitude the wavelength and speed of the wave?

Q2. If the waves in a pool have a wavelength of 1m, the frequency of 0.5times/sec, how many meters away would a particle of water be in 4seconds?

Waves(1-1,1-2).hwp

저장

Erin37
|
2013-01-11 21:01

Q1.

The speed, the amplitude, and the depth of the water are connected. The amplitude stands for the energy a wave is carrying, and the energy shrinks when the depth of the water decreases, and so does the speed. So the amplitude and the speed will decrease when the depth decreases. However, the wavelength of the wave is not influenced by the depth. So, when the depth of the water decreases, the amplitude and the speed will decrease, while the wavelength does not change.

Q2.

To get the speed of the waves, you have to multiply the wavelength and the frequency of the waves. If you multiply 1 and 0.5, you get 0.5. So you get that the speed of the waves is 0.5m/sec. To get how many meters the waves travel in 4 seconds, you have to multiply the speed and the time. If you multiply 0.5 and 4, you get two.

So the particle of the water will be two meters away in 4 seconds.

annie0717
|
2013-01-06 11:30

1.When the depth of the water decreses, the wave will have less energy. Amplitude is the measurement of the energy of a wave, thus the amplitude of the wave will decrease as well. On the other hand, wavelength, which calculates the distance between one wave crest or trough to the next, and speed(frequency), which is the number of waves passing a fixed point in a certain amount of time, does not have anything to do with the depth of a wave. To sum up, the amplitude decreases when the depth of the water decreases, while the wavelength and speed of the wave is not influenced by it.

2. Wavelength=1m, Frequency=0.5times/sec

Speed=1m*0.5=0.5(m/s)

0.5*4=2.

Thus, a particle of water will be two meters away in four seconds.

directioner
|
2013-01-04 20:42

Name: Daresa Lee(My korea name is Ga-Hyun Lee)

1. Waves that transfer energy through matter are known as (mechanical waves).--Page 11

2. The distance from one wave crest to the very next crest is called the (wave length.)--Page 17

3. In a (transverse wave), the direction in which the wave travels in perpendicular, or at right angles, to the direction of the disturbance--Page 13

4. Amplitue for a transverse wave is the distance between a line through the middle of a wave and a crest or trough.--Page 17

5. A (wave) is a disturbance that trasnfers energy from one place to another.--Page 9

6. A (trough) is the lowest point, or valley, of a wave.--Page 17

7. The number of waves passing a fixed point in a certain amount of time is called the (frequency).--Page 17

8. In a (longitudinal wave), the wave travels in th same direction as the disturbance.--Page 14

9. A (crest) is the highest point, or peak, of a wave.--Page 17

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