Given the reaction : 13 ^ 27 A1+ 2 ^ 4 He X+ 1 0 n Which particle is represented by X ? 12 ^ 28 Mg; 13 ^ 28 Al; 14 ^ 30 St; 15 ^ 30 P

Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

Long term exposure to waves can cause sunburns and skin cancer. a) visible b) infrared c) gamma rays d) ultraviole