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Current Electricity
Question
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Name the electromagnetic waves used for the following and arrange them in increasing order of their penetrating power.
(a)    Water purification
(b)    Rewrite sensing
(c)    Treatment of cancer.

Answer

(a) Ultra violet waves are required for water purification.
(b) Micro waves are used for rewrite sensing.
(c) Gamma rays are used for the treatment of cancer.

In increasing order of penetration powers:
microwaves < ultra violet waves < gamma rays

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Some More Questions From Current Electricity Chapter

What conclusion can you draw from the following observations on a resistor made of alloy manganin?

Current A

Voltage V

Current A

Voltage V

0.2

0.4

0.6

0.8

1.0

2.0

3.94

7.87

11.8

15.7

19.7

39.4

3.0

4.0

5.0

6.0

7.0

8.0

59.2

78.8

98.6

118.5

138.2

158.0

Answer the following questions:
A steady current flows in a metallic conductor of non-uniform cross-section. Which of these quantities is constant along the conductor: current, current density, electric field, drift speed?

Answer the following questions:
Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.