When an alarm clock rings, how will nearby air particles move in relation to the direction of the sound waves? . a) perpendicular to the direction of the waves. b) parallel to the direction of the waves. c) in the opposite directions of the waves. d) in the same direction as the waves

Which pair below describes isotopes of the same element? a) an atom with 6 protons and 8 neutrons - an atom with 8 protons and 6 neutrons b) an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons c) an atom with 8 protons and 8 neutrons - an atom with 7 protons and 8 neutrons d) an atom with 7 protons and 6 neutrons - an atom with 6 protons and 6 neutrons