All categories

3 years ago

15. A photoelectron experiment is performed on a sample of silicon using photons with an energy

Mathematics

1 answer:

leonid [27]3 years ago

5 0

Answer:

9.0×10^3K/moles

Step-by-step explanation:

ionization energy of these electrons = Energy of photons - kinetic energy of the electrons

Given

Kinetic energy of electron = 1.34×10^5

Energy of photons = 1.43 x 105 kJ/mole

Required

Ionization energy of these electrons

Ionization energy of these electrons = 1.43×10^5-1.34×10^5

ionization energy of these electrons = 0.09×10^5 kJ/mol

= 9.0 × 10^3 kJ/mol

Hence the ionization energy of these electrons is 9.0×10^3K/moles

You might be interested in

Please please help I really need it today please show work

Cerrena [4.2K]

Answer:

x=9.

perimeter=68

area=168

Step-by-step explanation:

First find the side that has a exact number which would be the bottom 28cm then look at the opposite side (2x+10) in order to find x subtract 10 from 28 which gives you 18, now 2x means x multiplied by 2 so what multiplied by 2 = 18? 9 meaning x=9. Now you are going to want to plug 9 in to your short side (x-3) once you plug it in it should look like this 9-3 and 9-3=6 meaning the short side is 6cm. In order for you to find the perimeter you have to add the sides together so 28+28+6+6 wich =68 and in order for you to find the area you have to multiply the length and the width so 28x6 which is 168.

hope that helped :)

4 0

3 years ago

Read 2 more answers

Find the sum of the geometrical equation -3 , 18 , -108 , if there are 7 terms

harina [27]

Hello from MrBillDoesMath!

Answer:

Sum = -119,962 ( I hope!)

Discussion:

Let's determine the pattern.

first term: -3

2nd term: (-3) * (-6) = 18 (multiply first term by -6)

3rd term: (18) * (-6) = -108 (multiply 2nd term by -6)

4th term : (-108)*(-6) = 648 ( etc)

5th term : (648)*(-6) = -3888 (etc)

6th term : (-3888)*(-6) = 23328 (etc)

7th term: (23328)*(-6) = -139967 (etc)

Sum = -119,962

A simpler way to do this is to use the formula for the sum of a geometric series to n terms. The series is

-3 Sum ( -6)^n n = 0, 1, 2, 3, 4, 5, 6

Regards,

MrB

P.S. I'll be on vacation from Friday, Dec 22 to Jan 2, 2019. Have a Great New Year!

3 0

3 years ago

3. Given the graph below, determine whether each statement is true or false.

MaRussiya [10]

Answers:

True
True
True
False
False

======================================

Explanation:

In this context, a zero is another term for x intercept or root. This is where the graph either touches or crosses the x axis. This occurs in three locations: x = -3, x = 2, and x = 0. So those are the three roots. That makes the first three statements true, while the remaining two others are false.

Side note: x = 0 doesn't always have to be involved. Its quite possible to have x = 0 not be an x intercept. The term "zero" is a bit misleading in that regard. I prefer either "root" or "x intercept" instead.

5 0

3 years ago

A survey by the state health department found that the average person ate 208 pounds of vegetables last year and 125 5/8 pounds

jonny [76]

Answer: The fraction of pounds of fruits over total pounds of fruits and vegetables is given by

$\frac{25125}{66724}$

Step-by-step explanation:

Since we have given that

Total amount of vegetables = 208 pounds

Total amount of fruits is given by

$125\frac{5}{8}\text{ pounds}$

Total amount of fruits and vegetables is given by

$208+125\frac{5}{8}\\\\=208+\frac{1005}{8}\\\\=\frac{1664+1005}{8}\\\\=\frac{2669}{8}\\\\=333.625\text{ pounds }$

So, we need to find the fraction of pounds of fruits over the total pounds of fruit and vegetables :

$\frac{\text{Pounds of fruits }}{\text{ total pounds of fruits and vegetables}}\\\\=\frac{\frac{1005}{8}}{333.62}\\\\=\frac{1005}{8\times 333.62}\\\\=\frac{1005}{2668.96}=\frac{25125}{66724}$