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Is Matter Around Us Pure
Question
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What are transverse waves? Explain with an example.

Answer

Transverse waves are the waves in which particles of the medium vibrate in a direction perpendicular to the direction of wave motion.

Fig. 12.2 (a). Pulse in a slinky.

i) As shown in the fig. above, take a long slinky and attach it to a wall at its one end.
ii) Give the other end an upward jerk. An upward hump is created in the slinky which travels along the slinky towards the fixed end. Such a sudden disturbance that lasts for short duration is called a pulse. 
iii) As shown in Fig. 12.2, if we continuously give up and down jerks to the free end of the slinky, a number of waves begin to travel along the slinky forming a wave train. 

iv) Each part of the slinky vibrates up and down while the waves travel along the rope. So the waves in the rope are transverse in nature.

Fig. 12.2 (b). Formation of transverse waves in a slinky.

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Some More Questions From Is Matter Around Us Pure Chapter

Which separation techniques will you apply for the separation of the following?


Fine mud particles suspended in water.

Write the steps you would use for making tea. Use the words—solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.

Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

Substance Dissolved

Temperature in K

283

293

313

333

353

Potassium nitrate

21

32

62

106

107

Sodium chloride

36

36

36

37

37

Potassium chloride

35

35

40

46

54

Ammonium chloride

24

37

41

55

66


What mass of potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 grams of water at 313 K?

Pragya makes a saturated solution of potassium chloride in water at 353 K and leaves the solution to cool at room temperature. What would she observe as the solution cools? Explain.

Substance Dissolved

Temperature in K

283

293

313

333

353

Potassium nitrate

21

32

62

106

107

Sodium chloride

36

36

36

37

37

Potassium chloride

35

35

40

46

54

Ammonium chloride

24

37

41

55

66


Find the solubility of each salt at 293 K. Which salt has the highest solubility at this temperature?

Substance Dissolved

Temperature in K

283

293

313

333

353

Potassium nitrate

21

32

62

106

107

Sodium chloride

36

36

36

37

37

Potassium chloride

35

35

40

46

54

Ammonium chloride

24

37

41

55

66


Pragya tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the following table, as grams of substance dissolved in 100 grams of water to form a saturated solution).

Substance Dissolved

Temperature in K

283

293

313

333

353

Potassium nitrate

21

32

62

106

107

Sodium chloride

36

36

36

37

37

Potassium chloride

35

35

40

46

54

Ammonium chloride

24

37

41

55

66

What is the effect of change of temperature on the solubility of a salt?

Explain the following giving examples:

Saturated solution

Explain the following giving examples:

Pure substance

Explain the following giving examples:


Colloid

Explain the following giving examples:


Suspension