The observed standard penetration test value in a deposit of fully submerged sand was 45 at a depth of 6 m. The average submerged unit weight of the soil is 9.7 kN/m3. The corrected N value is : (consider only overburden correction) (a) 43.76 (b) 67.14 (c) 54.63 (d) 58.95

43.54

Explanation:

Effective overburden pressure  will be

Overburden correction is given by

Where and are effective overburden pressure and overburden correction

Substituting the value of overburden pressure then

Taking hammer efficiency of 0.8,  drill rod length correction factor of 0.9 and  borehole correction factor of 1.05 then corrected SPT value will be

less than one you can't create energy

here are some information of the future of geothermal energy:

-the future of geothermal energy can pretty much be summed up with a single word: more

-scientists plan in going deeper than 120 meters

-we are hoping that one day, we will get all of our energy from renewable energy sources such as geothermal energy

hope this !