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Oliga [24]
3 years ago
11

The surface of the paper is phosphorescent. When light shines on it, some of the energy is absorbed and re-emitted slowly over t

ime. The blue LED causes the surface to glow, but the green LED does not. Would a red LED to cause the surface to glow? Select the best answer from the choices provided. View Available Hint(s) Select the best answer from the choices provided. No Yes
Physics
1 answer:
Ad libitum [116K]3 years ago
8 0

Answer:

No

Explanation:

Recall that the hierarchy of wavelength color from minimum wavelength to maximum wavelength is:

V < I < B < G < Y < O < R; and

E  \ \alpha  \ \dfrac{1}{\lambda}

As a result, blue light has a higher energy level than green and red light.

As a result, the surface glows due to the blue LED. The green LED, on the other hand, would not allow the surface to glow as much as the red LED, which has a lower energy level when compared to the green light. As a result, the red LED would not allow the surface to glow as well.

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Select the correct answer.
IgorC [24]

Answer:

D. Newton's Third Law of Motion

Explanation:

Newton's law of gravity is definitely not applicable to your hands. So we can cross this bad boy out

Newton's First Law is F=MA (force equals mass times acceleration). This is basically the root of most physics but it isn't the reason for your hand being red after hitting a wall.

Newton's Second law deals with velocities and forces, so even though you are apply a force your are not changing the velocity of the wall much.

Newton's Third Law basically says that for whatever force you apply to an object, that object will apply an equal and opposite force back to you. This is why your hand gets red. When you slap the wall with all your strength, the wall hits your hand back with the same amount of force. The 2nd law can also be seen when you're trying to push a desk and it won't budge. You are pushing on it, but the desk is pushing back. (there are multiple other factors applicable like friction but we physicists like to ignore them :) )

I hope this helps!

7 0
3 years ago
The momentum of an isolated system is conserved A) only in inelastic collisions. B) only in elastic collisions. C) in both elast
vovangra [49]

Answer:

B

Explanation:

because it change heat with the surrounding

8 0
3 years ago
Define Standard Unit​
Vinvika [58]

answer:

standard units are the units we usually use to measure the weight, length or capacity of objects.

explanation:

  • international system of units or SI units are standard units
  • these units used for measuring quantities are accepted worldwide
  • for example: kilogram is standard unit for mass, second is standard unit for measuring time
5 0
3 years ago
Read 2 more answers
Use the image below to answer the following question (ruler not to scale).
Svetradugi [14.3K]

Answer:

it depends on wether the + and - are facing eachother

or away from eachother

Explanation:

4 0
3 years ago
Read 2 more answers
The wavelengths of light emitted by a firefly span the visible spectrum but have maximum intensity near 550 nm. A typical flash
Reil [10]

Answer:

3.3\cdot 10^{15}

Explanation:

First of all, let's calculate the energy of a single photon of wavelength

\lambda=550 nm=5.5\cdot 10^{-7}m

which is given by

E_1 = \frac{hc}{\lambda}=\frac{(6.63\cdot 10^{-34}Js)(3\cdot 10^8 m/s)}{5.5\cdot 10^{-7} m}=3.6\cdot 10^{-19} J

The power of the flash is

P=1.2 mW=0.0012 W

and the time it lasts is

t=100 ms=0.1 s

so the total energy delivered in one flash is

E=Pt=(0.0012 W)(0.1 s)=1.2\cdot 10^{-3}J

This energy contains exactly N photons each of energy E_1, so the number of photons emitted in one flash is

N=\frac{E}{E_1}=\frac{1.2\cdot 10^{-3} W}{3.6\cdot 10^{-19}J}=3.3\cdot 10^{15}

3 0
3 years ago
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