Parameters of Waves

Which of the following parameters of a wave undergoes a· change when wave is reflected from a boundary?

Every EM wave has certain frequency. Name two parameters of an em wave that oscillate with this frequency.

Parameter not affected by sympathetic stimulation of heart

Name the elements or parameters of earth's magnetic field.

Which of the following is a parameter of senescence or old age?

Parameter OF Magnetization||Hysteresis Curve