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Is Matter Around Us Pure

Question

Wired Faculty App

A source is producing 15 waves in 3 seconds. The distance between a crest and a trough is 10 cm. Find (i) the frequency, (ii) the wavelength, and (iii) the velocity of the wave.

Solution

left parenthesis straight i right parenthesis space Frequency comma space space space space space straight v space equals space fraction numerator No. space of space waves space produced over denominator Time space taken end fraction space equals 15 over 3 space equals space 5 space Hz. left parenthesis ii right parenthesis space Since space the space distance space between space straight a space crest space and space the space neighbouring space trough space is space straight lambda over 2 comma space therefore comma space space space space space space space space space straight lambda over 2 space equals space 10 space cm space space space space space space space space space space or space space space space space space space space space straight lambda space equals space 20 space cm left parenthesis iii right parenthesis space space space space space space space v space equals space 5 space Hz comma space space space space space space straight lambda space equals space 20 space cm space equals space 1 fifth straight m therefore space space space space space Velocity comma space space space space v space equals space vλ space equals space 5 cross times 1 fifth space equals space 1 space straight m divided by straight s

Some More Questions From Is Matter Around Us Pure Chapter

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

Wheat grains from husk

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

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