Advertisements
Advertisements
प्रश्न
Two students are separated by a 7 m partition wall in a room 10 m high. If both light and sound waves can bend around obstacles, how is it that the students are unable to see each other even though they can converse easily?
Advertisements
उत्तर
Bending of waves by obstacles by a large angle is possible when the size of the obstacle is comparable to the wavelength of the waves.
On the one hand, the wavelength of the light waves is too small in comparison to the size of the obstacle. Thus, the diffraction angle will be very small. Hence, the students are unable to see each other. On the other hand, the size of the wall is comparable to the wavelength of the sound waves. Thus, the bending of the waves takes place at a large angle. Hence, the students are able to hear each other.
APPEARS IN
संबंधित प्रश्न
In a single slit diffraction experiment, the width of the slit is made double the original width. How does this affect the size and intensity of the central diffraction band?
In what way is diffraction from each slit related to the interference pattern in a double-slit experiment?
In a single slit diffraction experiment, when tiny circular obstacle is placed in path of light from a distance source, a bright spot is seen at the centre of the shadow of the obstacle. Explain why?
State two points of difference between the interference patterns obtained in Young’s double slit experiment and the diffraction pattern due to a single slit.
The focal length of a this lens in vacuum is f. If the material of the lens has µ = 3/2, its focal length when immersed in water refractive index 4/3 will
What is diffraction when light passes through a single narrow slit?
What are LN and M in the single-slit experimental setup?
Where is the screen placed in the single-slit experimental setup?
How is point P located in the single-slit experimental setup?
What appears at the centre of the single-slit diffraction pattern?
What appears on either side of the central maximum?
How does the intensity of secondary maxima change as you move away from the centre?
At \[\theta=0\], how do the distances from the secondary sources to point C compare?
Why is point C the brightest point of the single-slit diffraction pattern?
At which angle does the central maximum occur?
What path difference between corresponding rays from the two equal halves of the slit causes them to cancel?
What condition for a dark fringe follows from \[\frac{a}{2}\sin\theta=\frac{\lambda}{2}\]?
What happens to the intensity of the secondary maxima as \[n\] increases?
