12 Physics Activity :Diffraction

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12 Physics Activity :Diffraction



Measure the distance between the central spot and first and second bright spot for a given value of

a distance between grating and screen. Hence determine d.

Diffraction pattern using a laser beam

Aim : To determine the grating element (d) of the given grating.

Apparatus: Diffraction grating , laser pointer, stands , screen and meter scale.

Formula: nλ = d sin θ

Where λ = the wavelength of the laser light.

d = grating element

θ = the angle of diffraction.


Observation:

1. Wavelength of the laser light used (red) : λ=6328 Ao = 6.328 x 10-5 cm

Observation Table:


Note the experiment can be done by single slit method using D>1.5 m

Result: The grating element of diffraction grating is d= 15..555 x 10-5 cm.


Diffraction – MCQs (XII Physics Activity)

1.The diffraction pattern depends on:

A. Amplitude of light only
B. Wavelength of light
C. Speed of light
D. Intensity only

✔ Answer: B

2. In single-slit diffraction, secondary maxima are:

A. As bright as central maximum
B. Brighter than central maximum
C. Less intense than central maximum
D. Of equal width as central maximum
✔ Answer: C

3. The width of the central maximum is inversely proportional to:

A. Wavelength
B. Slit width
C. Screen distance
D. Intensity
✔ Answer: B

4. Diffraction effects are more pronounced for:

A. X-rays
B. Ultraviolet light
C. Visible light
D. Radio waves
✔ Answer: D

5. The bending of light around the edges of an obstacle is called:

A. Reflection
B. Refraction
C. Interference
D. Diffraction
✔ Answer: D

6.Diffraction of light is most prominent when:

A. Size of obstacle ≫ wavelength
B. Size of obstacle ≪ wavelength
C. Size of obstacle ≈ wavelength
D. Size of obstacle is infinite
✔ Answer: C

7.Diffraction shows that light:

A. Travels in straight lines only
B. Is a particle
C. Has wave nature
D. Has no speed
✔ Answer: C

8. In single-slit diffraction, the central maximum is:

A. Brightest and widest
B. Brightest and narrowest
C. Dark and narrow
D. Dark and wide
✔ Answer: A

9.The angular width of the central maximum in single-slit diffraction is:

A. λ/a

B. 2λ/a

C.λ/2a

D. a/λ

✔ Answer: B

10.The diffraction pattern becomes broader when:

A. Slit width is reduced

B. Slit width is increased

C. Slit width is same

D. Slit width is broad

Answer: A

https://wordwall.net/resource/104222268


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