Question

Fill in the blanks.

1. The mass of the cathode-ray particles is ...... (fixed /variable)
2. The mass of the anode-ray particles is ... (fixed / variable)
3. The mass of atoms, except that of hydrogen,
be explained without considering neutrons. (Can/ Cannot)
4. An atom has the same number of electrons, protons and neutrons if the mass number is.........
atomic number of the element. (double/triple)
​

Answer 1

Answer:

1. fixed

Cathode ray particles simply electrons. Their charge and mass of electrons are independent of the gas taken in the discharge tube. So, charge /mass ratio remain constant.

2 variable

The mass of anode ray particles depend on the gas taken in the tube. Hence , charge / mass ratio changes. Cathode ray particles simply electrons.

3 can

nuclear binding energy makes the mass of all atoms (except hydrogen-1, which only has 1 proton) slightly lighter that what you'd get by adding up the mass of the sub-atomic particles

4 double

Answer 2

Answer:

1-Fixed

2-Variable

3-Can

4-Double