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Is Matter Around Us Pure

Question

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Distinguish between a wave pulse and a periodic wave.

Solution

Pulse	Periodic wave
1. A pulse is a wave produced by a sudden disturbance of short duration.	1. A periodic wave produced by continuous and regular vibrations of the particles of the medium.
2. The medium oscillates for a short time and then returns to its undisturbed position.	2. The medium vibrates for a long time after being disturbed, in a periodic wave.
3. The wave forms are not repetitive.	3. The wave form has a basic pattern which repeats itself after a fixed interval.
4. It is formed in a small portion of the medium.	4. It is stretched over the entire length of the medium.

Some More Questions From Is Matter Around Us Pure Chapter

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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?

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