+91-8076753736 [email protected]

-->

Current Electricity

Question

Wired Faculty App

Green light of mercury has a wavelength 5.5 × 10^-5 cm. What is the wavelength in glass, if the refractive index of glass is 1.5? Given, velocity of light is 3 × 10⁸ ms^-1.

Solution

Wavelength of green light = 5.5 × 10^-5 cm
Refractive index = 1.5

Using the formula, we can calculate velocity

μ = \frac{c}{v} v = \frac{c}{μ} = \frac{3 \times 10^{8}}{1.5} = 2 \times 10^{8} m / s .

Thus, wavelength of glass,

λ = \frac{C_{g}}{v_{g}}

λ = \frac{2 \times 10^{8}}{5.45 \times 10^{8}}

λ = \frac{200}{545} λ = 0.36 m = 36 cm .

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.

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation