Question

MODEL ACTIVITY TASKS
CLASS - IX
PHYSICAL SCIENCE
Write the answers to the following questions :
1. Justify or criticize “Although the isobars have same mass numbers their
masses are not exactly same".
2. Why are the weights in a weight box kept in a 5:2:2:1 ratio?
3. Why is an aeroplane unable to fly in vacuum?
4. From his experiments, how did Rutherford conclude that most of the space
inside an atom is empty?​

Answer 1

Answer:

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Explanation:

MODEL ACTIVITY TASKS

CLASS - IX

PHYSICAL SCIENCE

Write the answers to the following questions :

1. Justify or criticize “Although the isobars have same mass numbers their

masses are not exactly same".

2. Why are the weights in a weight box kept in a 5:2:2:1 ratio?

3. Why is an aeroplane unable to fly in vacuum?

4. From his experiments, how did Rutherford conclude that most of the space

inside an atom is empty?

Answer 2

Explanation:

4) from his experiments Rutherford concluded that most of the space inside the atom is empty because the rays passed through the gold foil without any deflection.

so ,Hence he concluded that most of the space inside the atom is empty.

3) There is no air in the vacuum but the aeroplane needs air to travel .The pressure difference created in the air help the aeroplane fly .

Hence, The aeroplane can't fly in the Vacuum