The focal point of a concave mirror is IN FRONT OF the mirror.
The answer is; nodes
A standing wave occurs when two waves with the same properties moving in the opposite direction, in the same media, interfere with one another. Nodes are points where the waves interact destructively causing an appearance of the wave standing still. The opposite of nodes is antinodes where they are points of maximum displacement due to constructive destruction.
Answer:
I'm not super sure what your asking for. But these look like elements of communication from a speech or communications class.
--------------message-------->
O O
\ | / ------ channel ------ \ | /
/\ /\
sender (encoder) receiver (decoder)
<----------feedback-------------
- The sender (or encoder) encodes the message and sends it.
- The receiver (or decoder) decodes the message and receives it, then gives feedback to the sender.
- The channel is the medium through which the message is sent: this could be social media, email, text, talking, you name it.
- Body language can assist (or not) in sending the message.
Average speed = (distance covered) / (time to cover the distance)
Average speed = (60 kilometers) / (4 hours)
Average speed = (60/4) kilometer/hour
<em>Average speed = 15 km/hr</em>