Trace amounts of la (lanthanum), 4 = 139, will be investigated by irradiating a 10-g soil sample in a thermal neutron aux of 10 neutrons/cm's for 14 days, and determining the induced holа. if the "la activity was found to be 10 bq 1 hour after the end of the irradiation time, calculate the la concentration in the soil in units of ug org and ppm (parts per million by weight). given: 1) la abundance - 100% (activation) - 96 tua ( la) = 1.7 days

u can delete ur account.

1. go on google and write

2 open this and click on your profile pic and if your profile is not appearing, then u have to log in.

3. when u click on your profile pic, there appears four options on the top.

4. click on the 1st option and scroll down and go at the bottom.

5. click on edit profile.

6. there appears a option 'prefernces' and at that option at the right side , 'edit' is written.

7. click on the edit option.

8. there is a option " i want to delete my account" and click on that.

hope this u

and ur welcm

: )

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form