Tyndall Effect

Q. Which of the following phenomena is not due to atmospheric refraction?

1. Twinkling of stars
2. Tyndall effect
3. Oval shape of the Sun
4. Duration of the Sun’s visibility

Q.

Why is the Tyndall effect shown by colloidal particles? State four instances of observing the Tyndall effect.

Q.

The Tyndall effect is observed only when the following conditions are satisfied:

(a) The diameter of the dispersed particles is much smaller than the wavelength of the light used.

(b) The diameter of the dispersed particle is not much smaller than the wavelength of the light used.

(c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude.

(d) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.

1. (a) and (c)

2. (b) and (c)

3. (a) and (d)

4. (b) and (d)

Q.

One cannot see through fog because :

1. fog absorbs light.

2. the refractive index of fog is infinity.

3. light suffers total internal reflection at the droplets of fog.

4. light is scattered by the droplets of fog.

Q. What is tyndall effect ? Explain with an example.

Q.

State the relation between the color of scattered light and the size of the scattering particle.

Q.

What happens when a beam of sunlight enters a dusty room through a window ? Explain your answer.

Q.

The clear sky appears blue because

1. blue light gets absorbed in the atmosphere

2. ultraviolet radiations are absorbed in the atmosphere

3. violet and blue lights get scattered more than lights of all other colours by the atmosphere

4. light of all other colours is scattered more than the violet and blue colour lights by the atmosphere

Q.

Tyndall effect is the scattering of light by _________.

1. air particles
2. solid particles
3. liquid particles
4. colloidal particles

Q.

The diameter of colloidal particles is between _______ and ___________ m.

Q.

Which of the following will show the Tyndall effect why?

1. salt solution

2. milk

3. copper sulphate solution

4. starch solution

Q.

The phenomenon of scattering of light by the colloidal particles is called

1. Atmospheric scattering

2. Dispersion of light

3. Atmospheric refraction

4. Tyndall effect

Q.

When is the Tyndall effect observed?

(A)The diameter of the dispersed particles is much smaller than the wavelength of the light used.

(B)The diameter of the dispersed particle is not much smaller than the wavelength of the light used.

(C)The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude

(D)The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.

1. (A) and (D)

2. (B) and (D)

3. (A) and (C)

4. (B) and (C)

Q. The ___ is the scattering of light as a light beam passes through a colloid.

Q.

When scattering of light takes place in a colloidal solution the particles in it scatter light but did light passes through the particle which scatters it and move to next particle or does the particle of the colloid absorbs light?

Q.

In Tyndall effect, the colour of light that is scattered depends on

1. Colour of the scattering particle

2. Shape of the scattering particle

3. Size of the scattering particle

4. Both (a) and (c)

Q.

Which of the following statements is true about the Tyndall effect?

1. It is observed only when the size of the particles is generally between $10-11$ and$10-9m$in diameter.

2. It is observed only when the refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.

3. It is observed only when the diameter of the dispersed particles is not much smaller than the wavelength of the light used.

4. Both (B) and (C)

Q.

What is Tyndall Effect? Tyndall Effect can be observed when sunlight passes through the canopy of dense forest. Explain how this occurs.

Q.

Write two properties each of a solution, suspension and a colloid with respect to stability and filterability.

Q.

The phenomenon of scattering of light by the colloidal particles is known as ___.

1. tyndall effect

2. persistence of vision

3. dispersion

4. radiation

Q. Defenitions of
(i)Scattering of light
(ii) Tyndall effect
by the term "colloidal particles" in the definition of tyndall effect, what do we mean? Does it include particles such as air molecules, water droplets, dust particles, or just the colloidal particles found in colloids?

Q.

In Tyndall effect, the colour of light that is scattered depends on:

1. Size of the scattering particle.

2. Colour of scattering particle.

3. Temperature of the scattering particle.

4. Both temperature and size of the particles.

Q.

Tyndall effect is the scattering of light by

1. liquid particles

2. colloidal particles

3. air particles

4. solid particles

Q. What is Tyndall effect? Give a natural example of Tyndall effect.

Q.

The above diagram is the arrangement for observing scattering of light in colloidal solution, why does the beaker appear orange-red when seen through the slit MN?

1. Because blue light scatters most and remaining colours pass nearly unscattered

2. Because all colours scatter equally

3. Both (a) and (c)

4. Because red light scatters the most

Q. Which among the following is not an example of tyndall effect?

1. When sunlight passes through a canopy of a dense forest, tiny droplets in the mist scatter light
2. A beam of sunlight becomes visible as it passes through dust particles in the air of a room
3. The visible beam of headlights in fog
4. Blue colour of the sky

Q.

When a beam of light is passed through a colloidal solution, the light is

1. scattered

2. absorbed

3. refracted

4. reflected

Q. A. Differentiate the eye defects: Myopia and Hypermetropia
B. Explain the process of correction of eye defects using suitable diagram.
C. Why are traffic signals red in colour? [7 Marks]

Q. Let's assume you made a spaceship which can travel with a speed of 50, 000 km/seconds.Now you want to go to our nearest star Alpha Centauri which is 4 light years away. Considering that the speed of light is equal to 3, 00, 000 km/second, if you start your journey today, in how many years will you reach Alpha Centauri?

1. 20 years
2. 30 years
3. 24 years
4. 16 years

Q.

Which of the following is translucent in nature?

1. Solution

2. Colloid

3. Suspension

4. None of these