In what different ways can be sound heard?

What type of electromagnetic wave is used in security pens? a. x-rays c. microwaves b. visible light d. ultraviolet radiation select the best answer from the choices provided

How many hydrogen (h) atoms are in one molecule of sulfuric acid, h2so4? (1 points) 1 2 4 7

What was the purpose of the apollo program? to put a man in orbit to launch a spy satellite to launch a space station to put man on the moon