When Xiao Ming is doing his homework in his room at night, mosquitoes fly around, and their chirps are shrill, indicating that their voices are _ _ _ _ _ high; Xiaoming uses an electric mosquito repel

When Xiao Ming is doing his homework in his room at night, mosquitoes fly around, and their chirps are shrill, indicating that their voices are _ _ _ _ _ high; Xiaoming uses an electric mosquito repellent. (1) The chirping of mosquitoes is shrill, indicating that the pitch of their voices is high;

(2) When the incense piece is placed on the heating plate of the electric mosquito repellent, the temperature on the heating plate is high, which will transfer heat to the mosquito-repellent incense piece, and the temperature of the mosquito-repellent incense piece will increase and the internal energy will increase, which is changed by heat transfer;

(3) After being electrified for a period of time, the whole room can smell the smell of mosquito-repellent incense tablets, which means that mosquito-repellent incense molecules diffuse into the air, which is a diffusion phenomenon. The diffusion phenomenon shows that the molecules that make up the object are constantly moving irregularly.

Therefore, the answer is: tone; Heat transfer; Molecules are constantly moving irregularly.