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Sliva [168]
3 years ago
8

1. An excited lithium atom emits a red light with wavelength a = 671nm. What is the corresponding photon energy? hc (6.63 x 10-3

4).S)(3.0 x 108m/s)​
Physics
1 answer:
Rudiy273 years ago
6 0

Answer:

 E = 2,964 10⁻¹⁹ J

Explanation:

The energy of the photons is given by the Planck relation

          E = h f

the speed of light is related to wavelength and frequency

          c = λ f

we substitute

          E = h c /λ

let's reduce the magnitude to the SI system

          λ = 671 nm = 671 10⁻⁹ m

let's calculate

          E = 6.63 10⁻³⁴ 3 10⁸ /671 10⁻⁹

          E = 2,964 10⁻¹⁹ J

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Answer: D. it has been demonstrated to be without exception under certain stated conditions.

Explanation:

A <u>Law</u> is an affirmation (something established) based on repeated long-term observation of a phenomenon that has been studied and verified.  

That is: A law is present in all known theories and therefore is considered universal. In addition, a law can not be refuted, nor changed, because its precepts have been proven through various studies.  

<u>Unlike theory</u>, which is the set of rules and principles that describe and explain a particular phenomenon and <u>is subject to changes as new evidence emerges that gives meaning to it.  </u>

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3 years ago
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What happens when the voltage increases and the resistance stays the same in a electrical circuit?
Orlov [11]

Answer:

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Explanation:

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Where 'V' is the potential difference across the circuit and 'I' is the current in the circuit.

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3 years ago
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Explanation:

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2 years ago
PLS HELP. WILL MARK AS THE BRAINLIEST. PLS ANSWER STEP BY STEP.
USPshnik [31]

Answer:12

Explanation:

its the way u read it

3 0
3 years ago
Read 2 more answers
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