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zzz [600]
4 years ago
5

The most reactive metals are the?

Physics
2 answers:
photoshop1234 [79]4 years ago
7 0
I Know B for sure trust me had this quiz
elena-14-01-66 [18.8K]4 years ago
7 0
It is actually the Alkali metals, the reactivity depends mostly on its electronegativity 

The lower the electronegativity, the more reactive the metal will be.

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a weather balloon slowly expands as energy is transferred as heat from the outside air. if the average net pressure is 1.5×10^5m
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There is only one pressure this situation would be a "constant pressure" process
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4 years ago
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Find the wavelength of a photon which has 500.0 eV of energy.
jekas [21]

Answer:

2.5 x 10⁻⁹ m

Explanation:

E = Energy of photon = 500 eV = 500 x 1.6 x 10⁻¹⁹ J

c = speed of photon = 3 x 10⁸ m/s

λ = wavelength of photon = ?

Energy of photon is given as

E = \frac{hc}{\lambda }

inserting the values

500\times 1.6\times 10^{-19} = \frac{(6.63\times 10^{-34})(3\times 10^{8})}{\lambda }

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4 years ago
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3 years ago
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nikdorinn [45]

Answer:Yes

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How much potential energy does a 50-N box have when lifted at a height of 1.5M?
nikitadnepr [17]

The correct answer is: Option (A) 75 J

Explanation:

First, be careful with the units here. As you can see it is mentioned that there is a 50N box. It means that the weight (<em>mg</em>) of the box is given as the unit is <em>Newton</em>, not its mass (which is in kg).

As,

Potential-energy = mass * acceleration-due-to-gravity * height

PE = m*g*h --- (A)


In equation (A), mg is actually the weight of the box, which is given.

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Plug the values in equation (A):

PE = 50 * 1.5  = <em>75 J (Option A)</em>

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4 years ago
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