Answer:
speed = distance/time
this is the equation substitute your values and get the answer....btw check you question again..
Answer:
The values is 
Explanation:
From the question we are told that
The slit distance is 
The wavelength is 
At the first half of the screen from the central maxima
The number of bright spot according to the condition for constructive interference is

For maximum number of spot 
So


Now for the both sides plus the central maxima we have

substituting values


Answer:
Energy is the tendency to do work.
Explanation:
Energy unit is Joule
1 Joule means 1 kgm²/s²
Energy =Kinertic energy
=1/2 mv²
unit= kgm²/s²
So energy unit is derived unit.
The correct answer is A. B. C. Hope this helps!!
These choices are not "levels" of sound. They're frequencies of sound.
The lower limit of audible frequency is usually considered to be 20 Hz.
But there are some people with ears that can hear 10 Hz, and others ...
particularly the elderly ... who can't hear anything below 100 Hz.
The question is a rather poor one.