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Gnoma [55]
3 years ago
13

The cutoff between visible and infrared light is usually said to be somewhere between 700 and 800nm. Why is silicon transparent

to most infrared light but opaque to visible light?
Physics
1 answer:
Misha Larkins [42]3 years ago
6 0

Answer:

The  infrared  photon  does  not  have  greater  energy as  compare  to   visible  rays  so  infrared  rays  pass  through  but  due  to  greater  energy  than  the  gap  visible  rays  could  not  hence  silicon  is  transparent      to infrared  rays  but  silicon  is   opaque  to   visible  rays .

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A gas, behaving ideally, has a pressure P1 and at a volume V1. The pressure of the gas is changed to P2. Using Avogadro’s, Charl
Bond [772]

Answer:

Boyle's Law

\therefore P_1.V_1=P_2.V_2

Explanation:

Given that:

<u><em>initially:</em></u>

pressure of gas, = P_1

volume of gas, = V_1

<em><u>finally:</u></em>

pressure of gas, = P_2

volume of gas, = V_2

<u>To solve for final volume</u> V_2

<em>According to Avogadro’s law the volume of an ideal gas is directly proportional to the no. of moles of the gas under a constant temperature and pressure.</em>

<em>According to the Charles' law, at constant pressure the volume of a given mass of an ideal gas is directly proportional to its temperature.</em>

But here we have a change in the pressure of the Gas so we cannot apply Avogadro’s law and Charles' law.

Here nothing is said about the temperature, so we consider the Boyle's Law which states that <em>at constant temperature the volume of a given mass of an ideal gas is inversely proportional to its pressure.</em>

Mathematically:

P_1\propto \frac{1}{V_1}

\Rightarrow P_1.V_1=k\ \rm(constant)

\therefore P_1.V_1=P_2.V_2

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3 years ago
Which statement about protons is true?
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4 0
3 years ago
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steposvetlana [31]

Answer:

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Explanation:

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5 0
3 years ago
Examine this diagram of the human heart. what is the structure indicated by the arrow?
taurus [48]

Answer:

Right coronary artery

Explanation:

Right coronary artery (RCA). The right coronary artery supplies blood to the right ventricle, the right atrium, and the SA (sinoatrial) and AV (atrioventricular) nodes, which regulate the heart rhythm.

4 0
3 years ago
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A positively charged particle Q1 = +15nC is held fixed at the origin. A second charge Q2 of mass m = 9.5g is floating a distance
Paladinen [302]

Answer:

Q_2=4.4293\times 10^{22}\ nC

Explanation:

Given

charge on the fixed particle, Q_1=15\times 10^{-9}\ C

mass of the second charge, m_2=9.5\times 10^{-3}\ kg

distance between the fixed charge and the floating charge on the top, d=0.25\ m

  • According to the question the second charge is floating just above the fixed positive charge despite of gravity this means that the floating charge is also positive in nature and hence feels the repulsion from the fixed charge which is equal in magnitude to the gravitational force on the charge.

m_2.g=\frac{1}{4\pi\epsilon_0} \times \frac{Q_1.Q_2}{d^2}

where:

\epsilon_0= permittivity of free space

g = acceleration due to gravity

9.5\times 10^{-3}\times 9.8=8.85\times 10^{-9}\times \frac{15\times 10^{-9}\times Q_2}{0.25^2}

Q_2=4.4293\times 10^{22}\ nC

7 0
3 years ago
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