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6
MCQ (Multiple Correct Answer)

Two sources $S_1$ and $S_2$ of intensity $I_1$ and $I_2$ are placed 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
$S_1$ and $S_2$ have the same intensities
B
$S_1$ and $S_2$ have a constant phase difference
C
$S_1$ and $S_2$ have the same phase
D
$S_1$ and $S_2$ have the same wavelength
7
MCQ (Multiple Correct Answer)

Consider sunlight incident on a pinhole of width $10^3 \mathop A\limits^o$. 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
8
MCQ (Multiple Correct Answer)

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
9
MCQ (Multiple Correct Answer)

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
10
Subjective

Is Huygen's principle valid for longitudinal sound waves?

Explanation

When we are considering a point source of sound wave. The disturbance due to the source propagates in spherical symmetry that is in all directions. The formation of wavefront is in accordance with Huygen's principle.

So, Huygen's principle is valid for longitudinal sound waves also.

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