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mr Goodwill [35]
3 years ago
15

A student is given an assignment to demonstrate diffraction. He takes a photograph of a straw in a glass of water. The straw app

ears bent at the water level. Which best describes this example? A)This is a good example of diffraction.B)This is an example of dispersion and not diffraction.C)This is an example of refraction and not diffraction.D)This is an example of reflection and not diffraction.
Physics
2 answers:
morpeh [17]3 years ago
4 0

Diffraction or refraction

Svet_ta [14]3 years ago
4 0

Answer: C) This is an example of refraction and not diffraction.

Explanation: The reason for the straw to appear bent at the water's surface is because of the process of refraction. Light travels at different speeds in different medium because of the varying densities.

The light travels from air to water and thus the difference in speed results in an apparent shift of the position of part of straw under water and thus the part appears broken.

Reflection is the the return of sound or light energy from the surface without absorbing it.

Diffraction is the phenomenon which occurs when the wave encounters an obstacle.

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Debora [2.8K]

Answer:

the first one

Explanation:

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3 years ago
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Describe what happens to pressure as the force exerted on a given area increases.
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That's the definition of pressure ... force on a given area.

So when that force increases, it's an increase in pressure.
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Light waves do not need a medium to travel through. true or false.
melamori03 [73]

Light travels in electromagnetic waves in the form of photons. What do photons travel in? Can a frequency have weight? Carry weight? According to Einstien a photon with energy proportional to its frequency basically explains ultraviolet light(among other things), so does that mean light travels within a "larger" version of itself?

We know that light doesn't need a medium through which to travel because the speed of light is experimentally constant: independent of the movement of the source or detector or the direction in which it travels.

Light contrasts with sound, which travels through the air (or some other material medium). If you're stationary with respect to the air, then the speed of sound is the same in all directions. But if you're moving with respect to the air, the speed of sound will be the same in all directions relative to the air---which means that sound coming up in front of you will seem faster and sound catching up to you from behind will seem slower.

If light were a disturbance in a medium, it would exhibit the same behaviour. But light never does---its speed is the same under all circumstances. So it does you no good to postulate an aether. You can still do it, but it makes the theory more complicated than necessary. The only reason to postulate an aether is that you're uncomfortable with the idea of waves not needing a medium. But our modern understanding of quantum mechanics is that all kinds of particles have a wavelike nature, so, if you accept that matter can travel through empty space, you should have no problem accepting the same for light.

so it's true

6 0
3 years ago
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A car accelerates from rest to 37.3 m/s<br> in 7 sec. What is the acceleration?
Sergio039 [100]

Answer:

poopgshshsh

Explanation:

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8 0
3 years ago
An airplane is fl ying with a velocity of 240 m/s at an angle of 30.0° with the horizontal, as the drawing shows. When the altit
netineya [11]

Answer:

\theta=41.52^{\circ}

Explanation:

Given that,

Velocity of the  airplane, v = 240 m/s

Angle with horizontal, \theta=30^{\circ}

The altitude of the plane is 2.4 km, d = 2400 m

Vertical speed of the airplane, v_y=v\ sin\theta=240\ sin(30)=120\ m/s

Horizontal speed of the airplane, v_x=v\ cos\theta=240\ sin(30)=207.84\ m/s

So, the equation of the projectile for the flare is given by :

4.9t^2+120t-2400=0

On solving the above equation, we get the value of t as:

t = 13.04 seconds

Horizontal distance travelled,

d=v_x\times t

d=207.84\times 13.04

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Let \theta is the angle with which it hits the target. So,

tan\theta=\dfrac{2400}{2710.23}

\theta=41.52^{\circ}

Hence, this is the required solution.

4 0
3 years ago
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