Prove that the kinetic energy operator is Hermitian: T = - (h2/8m.pi2)d2/dx2
K
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DT
Đỗ Thanh Hải
CTVVIP
28 tháng 11 2021
* Choose word or phrase – A, B, C or D – that needs correcting.
1. He saw her while / he / went=> was going to school yesterday.
A B C D
2. The old man / is wearing => wearing a black suit is a famous energy researcher.
A B C D
3. If Mary went=> had gone / out last night, she would have missed seeing that film.
A B C D
4. Natural resources provide the raw material are=> bỏ needed to produce finished
A B C
goods.
D
5. In the last hundred years, traveling / has become much easier but=> and more
A B C D
comfortable.
6. I went to a reunion for students educating=> to educate in the physics department
A B C
during the 1980s.
D
7. The surgeon tried / their best to save his life, but unfortunately the
A B
operation was / successful => unsuccessful .
C D
8. In an essay / writing=> written in 1779, Judith Sargeant Murray promoted the cause
A B C
of /women’s education.
D
9. It was suggested that Pedro studies=> study the material more thoroughly before
A B
attempting / to pass the exam.
C D
10. Louisa May Alcott, she=> bỏ best known for her books for children, served as a
A B C
nurse during the Civil War.
D
DT
Đỗ Thanh Hải
CTVVIP
28 tháng 11 2021
* Choose word or phrase – A, B, C or D – that needs correcting.
1. He saw her while / he / went to school yesterday.
A B C D
2. The old man / is wearing a black suit is a famous energy researcher.
A B C D
3. If Mary went / out last night, she would have missed seeing that film.
A B C D
4. Natural resources provide the raw material are needed to produce finished
A B C
goods.
D
5. In the last hundred years, traveling / has become much easier but more
A B C D
comfortable.
6. I went to a reunion for students educating in the physics department
A B C
during the 1980s.
D
7. The surgeon tried / their best to save his life, but unfortunately the
A B
operation was / successful .
C D
8. In an essay / writing in 1779, Judith Sargeant Murray promoted the cause
A B C
of /women’s education.
D
9. It was suggested that Pedro studies the material more thoroughly before
A B
attempting / to pass the exam.
C D
10. Louisa May Alcott, she best known for her books for children, served as a
A B C
nurse during the Civil War.
D
VN
30 tháng 5 2019
Energy is one of the problem that many people are interested in. It is not an unfamiliar word. It is heard, said, discussed day after day. It is close to everyone's daily life. You turn on the lamp and it is energy that gives you light. You turn on a TV and it is energy that gives you pictures and sound. You ride a motocycle and it is energy that gives you movement. You cook your meals and it is energy that gives you heat to boil rice.
The problem is that the demand for energy is rising and that the price of energy is getting higher and higher. The supply of energy on earth is limited. It cannot provide us all forever. The shortage of energy in the future is inevitable. Therefor, saving energy is a must if we want to contine to live in a cafe and sound world.
2 What is the problem that the demand for energy?
It is rising
1 How is the price of energy nowaday?
It is getting higher and higher
3 Can we watch TV without Energy?
No, we can't
4 What Should you do to save energy at home?
- I turn off the lights when going out
- Taking shower instead of bath
- Using less private transport
#Yumi
ở toán tử động năng phải thêm dấu "_"