Explanation:
an echo mimics exactly what is said, this is like a mirror because when you look in a mirror every action you make is copied by your reflection
Answer:
False.
Explanation:
Mechanical waves require a medium in order to transport their energy from one location to another.
so, question number 10 answer is 82 watts
Answer:
3km due West
Explanation:
Displacement is the distance traveled in a specific direction. From this definition, we can see that displacement is a vector quantity that has magnitude and direction.
So;
For the first day, the person walks 4km East:
4km
Start ----------------------------→ first day
7km
← ------------------------------------------------------ Second day
The displacement of the boy = 7km - 4km = 3km due West
Answer:
The distance is 
Explanation:
From the question we are told that
The order of maximum diffraction is m = 2
The wavelength is 
The angle is 
Generally the condition for constructive interference for diffraction grating is mathematically represented as
where d is the distance between the lines on a diffraction grating
So
substituting values
