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BlackZzzverrR [31]

2 years ago

9

The energy levels of the positive ions that have just a single electron, like He , Li2 , or Be3 , etc., follow the formula Bohr

found for the hydrogen atom, except the energy levels are multiplied by the nuclear charge squared (Z2).
a. True
b. False

1 answer:

Sidana [21]2 years ago

3 0

The answer is false. Hope that helps

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What is the wave length of an electromagnetic radiation ,having a frequency of 5.2 x 10^12 Hz? Note: c= 3.00 x 10^8 m/s

olchik [2.2K]

Answer:

$\huge{5.77 \times {10}^{ - 5} m}$

Explanation:

The wavelength of a wave can be found by using the formula

$\lambda = \frac{c}{f} \\$

where

c is the speed of the wave

f is the frequency

From the question we have

$\lambda = \frac{3 \times {10}^{8} }{5.2 \times {10}^{ 12} } \\ \\ \\ \\ \large{ = 5.77 \times {10}^{ - 5} m}$

Hope this helps you

7 0

2 years ago

Chemists use activity series to determine whether which type of reaction will occur?

bazaltina [42]

Answer:

The correct answer is "single replacement".

Explanation:

The activity series is a representation of a series of metals that are organized according to their order of reactivity. They start from the highest order of reactivity to the lowest order of reactivity.

The purpose of the series is to determine which products are formed in single-displacement reactions. The higher-order metals replace the lower order metals if there are two of them in the same solution. If metal is higher in the series it is more reactive than a metal that is below it in the activity series.

Have a nice day!

5 0

3 years ago

A substance with a higher specific heat will take more energy to raise its temperature ?

Wewaii [24]

This is true, well done.

7 0

3 years ago

An object with mass m is attached to the end of a string and is raised vertically at a constant acceleration of g 6. If it has b

sattari [20]

11/10 MgL work has been done by the tension in the string. If the object has been raised a distance l from rest.

<h3>Define work done?</h3>

The definition of work is expanded so that it encompasses both the forces applied to the body and the overall displacement of the body. A constant force F is present before this block. The objective of this force is to move the body d meters in a straight line in the force's direction.

Given,

Mass of object, M

Acceleration of object, a = g/10

Distance covered vertically, L

Tension of string, T

Work done by tension in string, W

W = T × L

By applying equilibrium force on string,

T - Mg = Ma

g = gravitational acceleration

T - Mg = M (g/10)

T = M(g/10) + Mg

T = 11/10 Mg

By substituting the value in, W = T × L

W = 11/10 Mg × L

W = 11/10 MgL

∴ Work done by tension is 11/10 MgL.

To know more about work done, visit:

brainly.com/question/13662169

#SPJ4

8 0

1 year ago

In order to answer this question, you need to look around your immediate surroundings to find examples of rusting of iron or any

wariber [46]

Answer:

(i) rusting is caused by the reaction of oxygen and water on the surface of metals(iron).

(ii) rusting of iron makes it weak and dangerous for buildings since their foundation is made of iron, rusting renders cars useless, rusting can cause accidents.

(iii) by galvanizing iron

and by coating it.

Explanation:

hope it helps .

7 0

4 years ago