Two Sources of intensity are in front of a screen [Fig.(a)]. The pattern of intensity distribution seen in the central portion is given by Fig.(b).
In this case, which of the following statements are true?
(a) have the same intensities
(b) have a constant phase difference
(c) have the same phase
(d) have the same wavelength
1. (a, b, c)
2. (a, b, d)
3. (b, c, d)
4. (c, d)
Consider sunlight incident on a pinhole of width . The image of the pinhole seen on a screen shall be:
(a) a sharp white ring
(b) different from a geometrical image
(c) a diffused central spot, white in colour
(d) diffused coloured region around a sharp central white spot
1. (a, c)
2. (a, d)
3. (b, d)
4. (b, c)
Consider the diffraction pattern for a small pinhole. As the size of the hole is increased:
(a) the size decreases
(b) the intensity increases
(c) the size increases
(d) the intensity decreases
1. (a, b)
2. (a, c)
3. (b, d)
4. (c, d)
For light diverging from a point source:
(a) | the wavefront is spherical. |
(b) | the intensity decreases in proportion to the distance squared. |
(c) | the wavefront is parabolic. |
(d) | the intensity at the wavefront does not depend on the distance. |
1. | (a), (b) |
2. | (a), (c) |
3. | (b), (c) |
4. | (c), (d) |
I. | The central fringe will be white. |
II. | Closest bright fringe to the central fringe will be a violet fringe. |
III. | There will not be any dark fringe. |
1. | decreases |
2. | increases |
3. | remains the same |
4. | can increase or can decrease |
Assertion (A): | Radio waves can be polarised. |
Reason (R): | Sound waves in air are longitudinal in nature. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Light travels faster in the air than in glass. This is in accordance with:
1. | the wave theory of light. |
2. | the corpuscular theory of light. |
3. | neither (1) nor (2) |
4. | both (1) and (2) |
Given below are two statements:
Assertion (A): | To observe the diffraction of light the size of the obstacle/aperture should be of the order of 10-7 m. |
Reason (R): | 10-7 m is the order of the wavelength of visible light. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Given below are two statements:
Assertion (A): | It is not possible to have interference between the waves produced by two violins. |
Reason (R): | For interference of two waves the phase difference between the waves must remain constant.Given below are two statements. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |