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AfilCa [17]
3 years ago
8

When sunlight strikes oil on the surface of water a variety of colors are observed what is the best explanation for this observa

tion

Physics
1 answer:
klio [65]3 years ago
7 0
Light waves are reflected from front and back surfaces of the thin films and constructive interference between the two reflected waves occurs in different places for different wavelengths. Light shining on the upper surface of the thin film with thickness t is partly reflected at the upper surface (path abc). Light transmitted from the upper surface is partly reflected at the lower surface (path abdef). The two reflected waves come together at point P on the retina of the eye. Depending on the phase relationship, they may interfere constructively or destructively. Different colors have different wavelengths, so the interference may be constructive for some colors and destructive for others.

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What percentage of the takeoff velocity did the plane gain when it reached the midpoint of the runway? a plane accelerates from
ElenaW [278]
When is at the end of the runway the velocity of the plane is given by the equation vf^{2}=0+2*a*s    where s=1800 m is the runway length. Thus
vf^{2}=2*5*1800=18000 (m/s)^{2}      
vf =134.164 (m/s)  

At half runway the velocity of the plane is
v^{2}=2*5* \frac{1800}{2}=9000 ( \frac{m}{s} )^{2}
 
v= \sqrt{9000}=94.87 ( \frac{m}{s})

Therefore at midpoint of runway the percentage of takeoff velocity is
‰P= \frac{v}{vf}=  \frac{94.87}{134.164}=0.707
6 0
3 years ago
1. A car moves 20 m/s east for 5 sec, 10m/s north for 10 sec and then 30m/s west for 5 sec. Calculate a) displacement
aalyn [17]

Try the solutions described in the attached picture, note the answers are marked with green colour.

3 0
2 years ago
Jellyfish, earthworms, grasshoppers, and humans are all classified in the same......................
Pepsi [2]
They are all classified in the same kingdom
5 0
3 years ago
The Sun’s surface temperature is about 5800 K and its spectrum peaks at 5000 Å. An O-type star’s surface temperature may be 40,0
nirvana33 [79]

(a) 7.25\cdot 10^{-8}m

Wien's displacement law is summarized by the equation

\lambda = \frac{b}{T}

where

\lambda is the peak wavelength

b=2.898\cdot 10^{-3} m \cdot K is Wien's displacement constant

T is the absolute temperature at the surface of the star

For an O-type star, we have

T = 40,000 K

Therefore, its peak wavelength is

\lambda = \frac{2.898\cdot 10^{-3}}{40000}=7.25\cdot 10^{-8}m

(b) Ultraviolet

We can answer this part by looking at the wavelength range of the different parts of the electromagnetic spectrum:

gamma rays  

X-rays  1 nm - 1 pm

ultraviolet  380 nm - 1 nm

visible light  750 nm - 380 nm

infrared  25 \mu m - 750 nm

microwaves  1 mm - 25 \mu m

radio waves  > 1 mm

The peak wavelength of this star is

\lambda=7.25\cdot 10^{-8}m=72.5 nm

Therefore, it falls in the ultraviolet region.

(c) No

The Keck telescopes is actually a system of 2 telescopes in the Keck Observatory, located in Mauna kea, Hawai.

The two telescopes, thanks to several instruments, are able to detect  much of the electromagnetic radiation in the visible ligth and infrared parts of the spectrum. However, they are not able to detect light in the ultraviolet region: therefore, they cannot observe the star mentioned in the previous part of the problem.

7 0
3 years ago
Suppose Car 1 collides with Car 2; Car 2 was not moving. In an ideal situation with no friction, according to the Law of Conserv
insens350 [35]
Your answer is C it is slightly reduced
4 0
3 years ago
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