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Pani-rosa [81]
4 years ago
5

What is the approximate energy of a photon having a frequency of 4 x 10^7 Hz (h=6.6 x 10^-34]•s)

Chemistry
1 answer:
jok3333 [9.3K]4 years ago
5 0

Answer:

E = 26.4 ×10⁻²⁷ j

Explanation:

Given data:

Energy of energy =?

Frequency = 4×10⁷ Hz

Solution:

Formula:

E = hf

E = hf

E =  6.6  ×10⁻³⁴ m²Kg/s  . 4×10⁷ Hz

Hz = s⁻¹

j = m²Kg/s ²

E = 26.4 ×10⁻²⁷ j.

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A centimeter and millimeter differ from each other by a factor of _____ ?
Liono4ka [1.6K]



The answer is:  "10" .
_______________________________________________________________
  " A centimeter and millimeter differ from each other by a factor of "10" .
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Note:
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100 cm = 1 m


1000 mm = 1m

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7 0
3 years ago
Write the half-reactions as they occur at each electrode and the net cell reaction for this electrochemical cell containing indi
AlexFokin [52]

Explanation:

The given cell reaction is as follows.

       In(s)| In^{3+}(aq) || Cd^{2+}(aq) | Cd(s)

Hence, reactions taking place at the cathode and anode are as follows.

At anode ; Oxidation-half reaction : In(s) \rightarrow In^{3+}(aq) + 3e^{-} ...... (1)

At cathode; Reduction-half reaction : Cd^{2+}(aq) + 2e^{-} \rightarrow Cd(s) ....... (2)

Hence, balance the half reactions by multiplying equation (1) by 2 and equation (2) by 3.

Therefore, net cell reaction is as follows.

      2In(s) \rightarrow 2In^{3+}(aq) + 6e^{-}

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Net reaction: 2In(s) + 3Cd^{2+}(aq) \rightarrow 2In^{3+}(aq) + 3Cd(s)

Thus, we can conclude that the overall cell reaction is as follows.

        2In(s) + 3Cd^{2+}(aq) \rightarrow 2In^{3+}(aq) + 3Cd(s)

4 0
3 years ago
When you hear the word decahydrate, what number should be written in front of the formula for water?
LenaWriter [7]
10, deca means ten a decagon is a ten side polygon, a decimetre is one tenth of a metre a decade is ten years so your answer is ten.
4 0
3 years ago
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Answer:

True

Explanation:

Significant digits include non-zero digits (unless the zero is between two non-zero numbers)

In 12,785.000, there are 5 non-zero digits:

1 2 7 8 5

4 0
3 years ago
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3.14<br> What is this in scientific notation
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= 3.14 × 10 with the power of 0
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= 3.14e0
(scientific e notation)

= 3.14 × 100
(engineering notation)
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= 3.14
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3 0
3 years ago
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