Q11 of 17 Page 122

(a) What are the canal rays? State the nature of the constituents of canal rays.

(b) Who discovered canal rays?

a. Canal rays are anode rays which are a beam of positive ions given by anode in an experiment conducted by Goldstein when he passed electricity at high voltage through a gas at very low pressure in a discharge tube. They consist of positively charged particles.

b. E. Goldstein discovered these canal rays.


More from this chapter

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9

In the following table, the mass number and the atomic number of certain elements are given:


(a) Select a pair of isobars from the above table.


(b) What would be the valency of element ‘B’ listed in the above table?

 10

(a) List any two postulates of Bohr’s model of an atom.

(b) Draw a sketch of Bohr’s model of an atom with four shells


(c) name the three sub-atomic particles.

 12

Define valence of an element. Find the valency of chlorine and magnesium (At. No. of chlorine = 17, magnesium = 12).

 13

Complete the following table: