Answer:
Photodiodes are used in consumer electronics devices such as compact disc players, smoke detectors, medical devices and the receivers for infrared remote control devices used to control equipment from televisions to air conditioners. For many applications either photodiodes or photoconductors may be used.
Answer:

Explanation:
Since the surface is frictionless, momentum will be conserved. If the bullet of mass
has an initial velocity
and a final velocity
and the block of mass
has an initial velocity
and a final velocity
then the initial and final momentum of the system will be:


Since momentum is conserved,
, which means:

We know that the block is brought to rest by the collision, which means
and leaves us with:

which is the same as:

Considering the direction the bullet moves initially as the positive one, and writing in S.I., this gives us:

So kinetic energy of the bullet as it emerges from the block will be:

No, it should not be permitted. It can seriously damage one of the people participatings mind. It would overall not be good
The answer is A. subduction