Atomic and Nuclear Physics Answers

The radioactive nuclides Pt - 199 has a half-life of 30.8 minutes. A sample is prepared that has an initial activity of 7.56 x 10^11Bq. a) How many Pt -199 nuclei are initially present in the sample?
b) How many are present after 30.8 minutes?
c) What is the activity at this time?

The amplitude and frequency of an object executing simple harmonic motion are 0.01 m and 12 Hz respectively. What is the velocity of object at displacement 0.005 m? What is the maximum velocity of the object?

The working substance for a Carnot cycle is 8 lb of air. The volume at the beginning of isothermal expansion is 9 cubic feet and the pressure is 300 psi. The ratio of expansion during the addition of heat is 2 and the temperature of the cold body is 90 degrees Fahrenheit . NOTE: Indicate the pV and TS planes Find: - QA(heat added) - QR(heat rejected) - MEP(cycle mean effective pressure) -the ratio of expansion during the isentropic process - the overall ratio of compression.

If you start with 1000 nuclei of an isotope with a half-life of 12 days, after how long will there be 125 undecayed nuclei left?

we drive a distance of 1km at 16km/hr. Then we drive am additional distance of 1 km at 32 km/hr. what ia our average speed?

In a silicon crystal, how many covalent bonds does a single atom form?

What is the maximum number of electrons that can exist in the 7th shell of an atom?

A transverse wave is applied to a string whose mass per unit length is 3×10 raise to power -2kgmper -1.if the string is under a tension of 120N, calculate the speed of propagation of wave?

And also this,
A transverse wave is applied to a string whose mass per unit length is 3×10 raise to power -2kgmper -1.if the string is under a tension of 120N, calculate the speed of propagation of wave?

Determine the frequency of the first overtone of a closed pipe of a length 30cm, if the end correction is 0.8cm and the velocity of sound is 346 meter per second