Question

1_The speed of light in air is equal to speed of light glasss.

F or T

2_In the diffraction grating experiment ,The space Between every tow adjacent lines(d) is directly proprtional to number of lines per mm

F or T

3_ absorptance equals 1 minus transmittance.

F or T

4_ The speed of light is

1_ The distance light can travel in a unit of time through a given substance

2_None

3_ The distance light can travel in a unit of mass through a given substance

4_ The time light can travel in a unit of length through a given substance

Q_5 :The intensity of light is inversly proportional to the square of the distance from the source.

T or F

Q_6: When two waves meet in a way that their crests line up together, then it's called

1_None

2_ Constructive interference

3_ Rayleigh interference.

4_ Destructive interfernce..

Q7: Standard value of the velocity of light is 3*10 m/s and the experimental value of the speed of light is 3.005*10°. Then the percentage error is .... %

Q8 The More light a material absorbs, the lower its absorption coefficient will be.

T Or F

Answer 1

1) False

Speed of light depend on refractive index of material. Air and glass have different refractive index thus speed will be different.

2) False

The space Between every two adjacent lines(d) is inversely proprtional to number of lines per mm N.

3) False

Relation between transmittance and absorbance is

A = 2 - log₁₀ T

4) speed = distance/time

Option (1)

5) True

6) this condition is called constructive interference as amplitude add togather.

7) percentage error =

[Approximate Value − Exact Value| /|Exact Value|] ×100

= [(3.005-3.000)/3]×100

= 0.17%

8) False

More light absorbed by a material having high absorption coefficient.