What is the critical angle from cubic zirconia (n = 2.16) to air? Will an angle of 25° produce total internal reflection?

Which of the following would not be taken into consideration when describing the quality of a sound

Frank just graduated from eighth grade. assuming exactly four years from now he will graduate from high school how many seconds does he have until his high school graduation

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical