- #1

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter jegues
- Start date

- #1

- #2

collinsmark

Homework Helper

Gold Member

- 3,169

- 1,931

Look at the y-intercept. Each wave crosses the y-axis exactly halfway between the origin and the wave's maximum amplitude. What sort of "angle" causes the sine function to be half its maximum amplitude?How does one go about solving a problem like this? I don't see how they get actual values from just the photo.

Can someone explain?

- #3

jegues

- 1,097

- 3

Look at the y-intercept. Each wave crosses the y-axis exactly halfway between the origin and the wave's maximum amplitude. What sort of "angle" causes the sine function to be half its maximum amplitude?

I know the angle you're talking about is 30 degrees.

When I look at it, it looks like the first wave has a phase of -45 degrees and the second a phase of -135 degrees, but those options aren't present...

Because at 45 degrees it would be half way to reaching its maximum value at 90 degrees.

- #4

SammyS

Staff Emeritus

Science Advisor

Homework Helper

Gold Member

- 11,600

- 1,188

Look at the distance (on the x-axis) from the x-intercept to the x value of the maximum. Then compare that and where the y-intercept is (x=0). Looks to me like x=0 is about 1/3 the distance from the x-intercept to x of the max. 45° is halfway from the x-intercept to where Sine has it's max. The value of sine(45°) = 1/√(2) ≈ 0.707. The y-intercept does not look (to me) like it's close to being 70% of the max value.I know the angle you're talking about is 30 degrees.

When I look at it, it looks like the first wave has a phase of -45 degrees and the second a phase of -135 degrees, but those options aren't present...

Because at 45 degrees it would be half way to reaching its maximum value at 90 degrees.

If

Share:

- Replies
- 15

- Views
- 787

- Replies
- 5

- Views
- 392

- Replies
- 14

- Views
- 591

- Replies
- 1

- Views
- 252

- Last Post

- Replies
- 5

- Views
- 498

- Replies
- 7

- Views
- 380

- Replies
- 5

- Views
- 344

- Replies
- 4

- Views
- 137

- Replies
- 2

- Views
- 221

- Replies
- 9

- Views
- 824