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nlexa [21]
3 years ago
11

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

Chemistry
1 answer:
hjlf3 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 <em>5 % visible light</em>, 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 <em>15 % visible light</em> 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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1. Express in conventional notation (no exponents) in the space provided within the
mina [271]

Answer:

a) 320: two significant figures.

b) 2,366: four significant figures.

c) 73.0: three significant figures.

d. 532.5: four significant figures.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to write each number by knowing we move the decimal places to the right as much as the exponent is, and also, we count every figure, even zeros, because they are to the right of the first nonzero digit:

a) 320: two significant figures because the rightmost zero is not preceded o followed by a decimal place.

b) 2,366: four significant figures.

c) 73.0: three significant figures, because the zero is followed by the decimal place.

d. 532.5: four significant figures.

Regards!

7 0
3 years ago
What is the volume of 2.10 moles of chlorine gas (Cl2) at 273 K and 1.00 atm?
Rasek [7]
Ideal gas law:
PV=nRT    ⇒  V=nRT / P
P=pressure=1 atm
V=volume
n=number moles=2.10 moles
R=0,082 Atm l/ºK mol
T=temperature=273 K

V=(2.10 moles*0.082 (atm l)/º(K mol)*237ºK)  / 1 atm=47.01 litres

47.1 L
5 0
3 years ago
How many grams of sodium nitrate. NaNO3, are soluble in 100
natka813 [3]

Answer:

Your correct answer is D. 40 g

Explanation:

Please mark brainliest!

4 0
3 years ago
Read 2 more answers
B- How many electrons does sodium have?
ziro4ka [17]

Answer: sorry I’m late but it is 11 electrons

Explanation:

7 0
3 years ago
Which of the following must be the same in atoms of the same element? (Ex: all atoms of silver)
rewona [7]

Answer:

option b = atomic number

Explanation:

The atomic number of silver is 47. Its isotopes range from Ag⁹³ - Ag¹³² . The naturally occurring silver is made up of two stable isotopes i.e ₄₇Ag¹⁰⁷ and ₄₇Ag¹⁰⁹. The percentage of  Ag¹⁰⁷ is 51.84% so it is more abundant than ₄₇Ag¹⁰⁹. Their atomic masses are different but the atomic number is same i.e 47.

A neutral atom have equal number of protons and neutrons. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example in case of silver 47 protons and 47 electrons are present.  The number of protons or number of electrons are the atomic number of an atom while the number of protons and number of neutrons are the mass number of an atom. Every atom consist of nucleus or a positive center. The protons and neutrons are present with in the nucleus while electrons are present out side the nucleus. All these three subatomic particles construct an atom.

4 0
2 years ago
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