EASY
9th CBSE
IMPORTANT
Earn 100

Are electrons present in all matter?

Important Questions on Structure of the Atom

MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 19
Draw a labeled diagram showing the presence of cathode rays in a discharge tube.
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 20
Explain the formation of cathode rays in a discharge tube.
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 21
What happens when the pressure inside the discharge tube is reduced to i. 5 mm of Hg ii. 0.01 mm of Hg?
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 22

What conclusions can you draw about the nature of cathode rays from the following observations in experiments in a discharge tube?

i. Cathode rays are deflected towards anode in an electric field,

ii. Cathode rays rotate a paddle wheel placed in their path.

iii. Cathode rays cast shadow of the object placed in their path.

MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 23
List the observations when a discharge tube is connected to a source of high potential difference and the pressure of air is reduced gradually.
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 24
Cathode rays consist of a beam of fast moving _____.(Electrons/Protons)
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 24
The charge of the electron is _____ ×10-19 C.1.602/1.627
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE CHEMISTRY 9>Chapter 4 - Structure of the Atom>CHECK YOUR PROGRESS>Q 24
The mass of an electron is _____ u.