(b) In 30 hours , a sample of plutonium - 243 decays to (1)/(64) of its original amount.Determine the half- life of the isotope. [TC3]5) Nitrogen -16 has a half-life of 7.2 seconds. How much nitrogen -16 will remain in a 100 g sample in 21.6 seconds?7. How much heat must be removed from 0.600kg of iron to lower its temperature from 100^circ C to 50.0^circ C (c_(lron)=0.450J/g^circ C)7) There are 5 successive compressions of a sound wave train in 7.20 cm. If the sound wave travels 6.80 km in 20.0 seconds.determine the frequency of the sound wave. (1.89times 10^4Hz)- Distinguish between nearsightedness farsightedness and astigmatism. Use a ray diagram to show how the image is formed in each condition. squarePREV 179180181182183184185186187 NEXT
