<span>Infrared radiation also called as infrared light was discovered by Sir William Herschel in 1800.It is an electronic magnetic radiation with longer wavelengths than those of a visible light.It involves waves rather than particles. It lies at frequencies just below the frequencies of visible light.</span>
D. How high do the sound waves go
Answer:
A ruler.
Explanation:
Just measure height, length and width and multiply each.
Answer:

Explanation:
Given:
- length of a steel-string,

- area of the string,

- Young's modulus of the steel,

- force of tension on the string,

We have the relation for change in length:



