How do bats avoid obstacles in their way, when in flight?

Explain how do bats locate the obstacles and prey in their way.

To detect obstacles in their path, bats produce

How do plants get nutrients ?

A : When tiny circular obstacle is placed in the path of light from some distance, a bright spot is seen at the centre of the shadow of the obastacle. R : Destructive interference occurs at the centre of the shadow of circular obstacle.

(a) Define a wavefront. Using Huygen's principle, verify the laws of reflection at a plane surface . (b) In a single slit diffraction experiment the wildth of the slit is made double the orignal width. How does this affect the size and intensity of the central diffraction band ? Explain. (c) When a tiny circular obstacle in placed in the path of light from a distance source, a bright spot is seen at the centre of the obstacle . Explain why.

In how many ways can 12 members be seated at a round table when the secretary and the joint secretary are always the neighbours of the president.

In a singleslit diffraction experiment, when a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow of the obstacle. Explain why ? State two points of difference the interference pattern obtained in Young's double slit experiment and the diffraction pattern due to a single slit.

How do autoimmune diseases result?

How do cells increase in number?

How do solute particles affect the water potential?