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Chemistry -unit -2
1. Assume you are listening bisrat FM 101.1 MHz live football streaming by host of Mesele Mengistu. Find the wave length of these radio wave ?
A. 3m
B.300nm
C. 1.5m
D. 1500 nm
2. Which electron excitation have the lowest quantum of energy?
A.ni=1 and nf=2
B. ni=2 and nf=3
C. ni=3 and nf=4
D. ni=5 and nf=6
3. There is a minimum frequency needed to emits silver electrons with specfic light of wave length 400nm.and atinstant it emit its electron by blue light of wave length 700nm .What is its kenetic energy ?
A.1.65 ×1^-17j
B. 8.24×10^18 j
C. 1.2×10^-19 j
D. 5× 10^-20 j
4.One of the following have a high electro magnetic radiation , which one?
A. Alpha particles
B. Betta particles
C. Gamma rays
D. X rays
5. Calculate the wave length of a silver electron that is emitted by certain light wave ?
A. 1.2×10-¹¹m
B. 2.4 ×10-¹²m
C. 6×10-¹³ m
D. 645nm
6. Which one the following is true about position and location of electron ?
A. We can find the position and direction of electron at instant time around the orbit?
B. The position of Valance electrons are determineable while the inner is impossible.
C. The position of electron fixed at its orbital state
D. The spontaneous determination of electrons' position is impossible.
7.Which of the following was discovered by using alpha scattering experiment ?
A.Electron
B.Neutron
C.Proton
D. Nucleus
8.Which one of the following electron configuration principle is correctly matched with its ideology?
A. Aufbau principle States that each of 2p orbitals will hold a single electron before any of them receive the second electron.
B. Pauli exclusion principle- no two electrons can have the same quantum number ?
C. Hindus principle- electrons occupy the lowest energy orbital.
D. Pauli's exclusion principle:electrons occupy the lowest energy orbital before entering the higher energy orbital
9. One of the following decrease as we go down the group?
A.Electron affinity
B.Atomic size
C.Metallic character
D. Atomic radius
10.Which one is not radioactive element?
A.Ra
B.C
C.Ag
D.N
@high_preparatory
1. Assume you are listening bisrat FM 101.1 MHz live football streaming by host of Mesele Mengistu. Find the wave length of these radio wave ?
A. 3m
B.300nm
C. 1.5m
D. 1500 nm
2. Which electron excitation have the lowest quantum of energy?
A.ni=1 and nf=2
B. ni=2 and nf=3
C. ni=3 and nf=4
D. ni=5 and nf=6
3. There is a minimum frequency needed to emits silver electrons with specfic light of wave length 400nm.and atinstant it emit its electron by blue light of wave length 700nm .What is its kenetic energy ?
A.1.65 ×1^-17j
B. 8.24×10^18 j
C. 1.2×10^-19 j
D. 5× 10^-20 j
4.One of the following have a high electro magnetic radiation , which one?
A. Alpha particles
B. Betta particles
C. Gamma rays
D. X rays
5. Calculate the wave length of a silver electron that is emitted by certain light wave ?
A. 1.2×10-¹¹m
B. 2.4 ×10-¹²m
C. 6×10-¹³ m
D. 645nm
6. Which one the following is true about position and location of electron ?
A. We can find the position and direction of electron at instant time around the orbit?
B. The position of Valance electrons are determineable while the inner is impossible.
C. The position of electron fixed at its orbital state
D. The spontaneous determination of electrons' position is impossible.
7.Which of the following was discovered by using alpha scattering experiment ?
A.Electron
B.Neutron
C.Proton
D. Nucleus
8.Which one of the following electron configuration principle is correctly matched with its ideology?
A. Aufbau principle States that each of 2p orbitals will hold a single electron before any of them receive the second electron.
B. Pauli exclusion principle- no two electrons can have the same quantum number ?
C. Hindus principle- electrons occupy the lowest energy orbital.
D. Pauli's exclusion principle:electrons occupy the lowest energy orbital before entering the higher energy orbital
9. One of the following decrease as we go down the group?
A.Electron affinity
B.Atomic size
C.Metallic character
D. Atomic radius
10.Which one is not radioactive element?
A.Ra
B.C
C.Ag
D.N
@high_preparatory