# Evan's Space

## Steel is used to make permanet magnet

Steel is a hard magnetic material. When magnetized, it is not as strong as soft iron. But steel retains its magnetism, hence it is used to make permanent magnets e.g compass need, speaker, fridge door.

Iron is a soft magnetic material. It can be easily and strongly magnetised. But it loses its magnetism easily. Hence it is used to make temporary magnet e.g. Electromagnet.

Do remember that compass is like a freely suspended magnet. It is made of steel!

## Light and sound wave diagram in different mediums with different density

Light and sound are both waves. So both carry energy from one place to another.

Light, which is part of the electromagnetic spectrum, is a transverse wave, It can travel through a vacuum at speed 3.0 x 108 m/s. As the light travels from an optically less dense medium (air) to an optically denser medium (liquid or glass), the light undergoes refraction and bends towards the normal due to a decrease in speed.

Light: Optically less dense medium to denser medium:
– speed decreases
– wavelength shorter
– frequency remains constant

Sound is a longitudinal wave. It requires a medium to pass through and it cannot pass through a vacuum. Opposite to light, as the sound travels from a less dense medium (air) into a denser medium (water or solid), the speed increases.

Sound: Less dense medium to denser medium:
– speed increases
– wavelength longer
– frequency remains constant

Refers to the image below to understand how the waves behave in different mediums.
Click here to revise on the calculation of refractive index for light