The half-life of radium-226 is 1620 years. What percentage of a given amount of the radium will remain after 900 years

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.

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal

Which of these is an intensive property of a substance