- Home
- General Science
Physical Chemistry -- Atomic Structure
6.
Rutherford’s α-particle scattering experiment led to the conclusion that
- A.mass and energy are related
- B.the mass and the positive charge of an atom are concentrated in the nucleus
- C.neutrons are present in the nucleus
- D.atoms are electrically neutral
- Answer
- Report
Answer : [B]
7.
What are the average distance and the most probable distance of an electron from the nucleus in the 1s orbital of a hydrogen atom (a0 = the
radius of the first Bohr orbit)?
- A.1.5a0 and a0
- B.a0 and 5a0
- C.1.5a0 and 0.5a0
- D.a0 and 0.5a0
- Answer
- Report
Answer : [A]
8.
Calculate the mass of a deuteron, given that the first line in the Lyman series of hydrogen lies at 82259.1 cm-1.
- A.1.66 x 10-27 kg
- B.8.3 x 10-28 kg
- C.6.68 x 10-27 kg
- D.3.34 x 10-27 kg
- Answer
- Report
Answer : [D]
9.
The energy of a 700-nm photon is
- A.1.77 eV
- B.2.47 eV
- C.700 eV
- D.3.57 eV
- Answer
- Report
Answer : [A]
10.
A 1-kW radio transmitter operates at a frequency of 880 Hz. How many photons per second does it emit?
- A.1.71 x 1021
- B.1.71 x 1030
- C.6.02 x 1023
- D.2.85 x 1026
- Answer
- Report
Answer : [B]
|
|
||||||||||||||||||||||||||||
