Question

I really need help like a lot I only got 2 days so I need help, and the answer has to be right, please!

1. A lifeguard on a beach observes that waves have a speed of 2.60 m/s and a distance of 2.50 m between wave crests. What is the period of the wave motion? Please show all work.

2. . A green object will absorb _________ ___________ light and reflect ____________________ light.

Answer 1

Answer:

1. Wave period = 0.962 s

2. Will absorb red and blue and reflect green

Explanation:

1.

The wave period is:

$T = \frac{\lambda }{v} \\Where: \\T: Wave period \\ \lambda : Wavelength \\v: velocity$

Wavelength is the distance between crests. So replacing the given information:

$T = \frac{2.50}{2.60} = 0.962 s$

2. In simple words the color of an object is the light it reflects. A green object reflects green light, and the rest is absorbed (red and blue).

Answer 2

Answer:

1) Period of wave motion = T = 0.9615 s

2) Green object will absorb red (Long wavelength) and blue (short wavelength) and will reflect green.

Explanation:

First Part:

Distance between two crests = wavelength = λ = 2.50 m

Speed of the waves = v = 2.60 m/s

We know that,  

v = f λ

v = λ/T

T = λ/v   ……… (i)

By putting values in equation (i),

T = 2.50/2.60

T = 0.9615 s

Second part:

When an object absorbs red and blue colors, it appears green. Green object will always reflect green color making it appear green.