Cathode rays fall on a small object between the cathode and the anode. A shadow of the same size and shape as that of the object is observed on the wall opposite to the cathode. What conclusion can you draw from the above statement regarding the properties of cathode rays?

The postulates of Dalton’s law are given below:

a) Atom can neither be created nor destroyed.

b) Atoms of different elements may combine with each other in a fixed simple whole number ratio to form compound atoms.

i. Which postulate of Dalton’s atomic theory is based on the Law of Definite Proportions?

ii. Which postulate of Dalton’s Atomic Theory is based on the Law of Conservation of Mass?

Rani prepared carbon monoxide in the laboratory. It contained 15g of carbon and 20g of oxygen. Ram also prepared carbon monoxide but using another method. It contained 42.9% of carbon. Show that the data of Rani and Ram are in accordance with the Law of Definite Proportions.

Gomathi filled a discharge tube with a particular gas and connected it as shown in the figure.

She applied high voltage but the bulb did not glow. What should Gomathi do to make the bulb glow?

Observe the size and direction of your shadow, when you stand in the sunlight in the morning and in the evening.

(i) Is the length of your shadow the same as your height?

(ii) What is the direction of the shadow? Does it fall in the direction of the source of light or in the direction opposite to the light source?

(iii) Compare the nature of the shadow formed in this activity with that of the shadow formed when an object is kept in the path of the cathode rays.