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2 years ago

Using the law of conservation of energy, explain why an LED light is more energy efficient that an incandescent light bulb.

Chemistry

1 answer:

hjlf2 years ago

3 0

Answer:

An LED light uses one-third the energy of an incandescent bulb to produce the same amount of light.

Step-by-step explanation:

A typical 100 W incandescent bulb produces about 5 % visible light, 83 % IR radiation, and 12 % heat (it is the IR radiation that makes the bulb feel hot).

It produces about 5 J of light energy for every 100 J of energy input.

A typical LED bulb produces about 15 % visible light and 85 % heat (LEDs feel cool, because they don't produce IR radiation).

It produces about 15 J of light energy for every 100 J of energy input.

Thus, an LED light is about three times as efficient at converting electrical energy into light

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If the half-life of a radioactive substances is 590 million years and you have 40 atoms of it, how many half-lives will have pas

Nady [450]

Answer:

Explanation:

Applying,

$2^{n'}$ = R/R'............... Equation 1

Where n' = number of halflives that have passed, R = Original atom of the substance, R' = atom of the substance left after decay.

From the question,

Given: R = 40 atoms, R' = 5 atoms

Substitute these values into equation 1

$2^{n'}$ = 40/5

$2^{n'}$ = 8

$2^{n'}$ = 2³

Equation the base,

n' = 3

3 0

2 years ago

Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Zn2+, Ni4+, F-

hram777 [196]

Ionic compounds are formed between oppositely charged ions.

A binary ionic compound is composed of ions of two different elements - one of which is a positive ion(metal), and the other is negative ion (nonmetal).

To write the empirical formula of binary ionic compound we must remember that one ion should be positive and other ion should be negative, then only the correct formula should be written. To write the empirical formula the charges of opposite ions should be criss-crossed.

First empirical formula of binary ionic compound is written between $Zn^{2+} (Positive ion)and F^{-} (Negative ion)$

First Formula would be $ZnF_{2}$

Second empirical formula is between $Zn^{2+}(Positive ion) and O^{2-}(Negative ion)$

Second Formula would be $Zn_{2}O_{2}$

Note : When the subscript are same they get cancel out, so $Zn_{2}O_{2}$ would be written as $ZnO$

Third empirical formula is between $Ni^{4+}(Positive ion) and F^{-}(Negative ion)$

Third Formula would be : $NiF_{4}$

Forth empirical formula is between $Ni^{4+}(Positive ion)and O^{2-}(negative ion)$

Forth Formula would be : $Ni_{2}O_{4}$ or $NiO_{2}$

Note- The subscript will be simplified and the formula will be written as $NiO_{2}$ .

The empirical formula of four binary ionic compounds are : $ZnF_{2}, ZnO, NiF_{4},NiO_{2}$

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2 years ago

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Which of the following sets represents a pair of isotopes? (2 points) Question 6 options: 1) 35Cl and 37Cl 2) 40Ar and 40K 3) O2

nikitadnepr [17]

Isotope - the same element, but different atomic mass so 1)35 Cl and 37 Cl

4 0

2 years ago

Is naf an acidic, basic, or neutral solution?

lara31 [8.8K]

Its a base

as Na+ dissociates in the water and it has no basic nor acidic properties its neutral]

but the F- that also dissociates has certain basic properties

hope that helps

4 0

2 years ago

What activates a convection current, starting the flow of a fluid ??

Grace [21]

Hey there!

What activates a convection current, starting the flow of a fluid ?

Answer: 

D. Temperature differences in the mantle 
Hope this helps
Have a great day (:

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2 years ago

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