When does a solar eclipse take place?
a. when earth moves into the suns shadow
b. when earth moves into the moons shadow
c. when the moon moves into earths shadow
d. when the sun moves into the earths shadow

Which subshell is represented by the actinides family?

Name atleast 3 type of energy associated with the microwave

6) (a) calculate the absorbance of the solution if its concentration is 0.0278 m and its molar extinction coefficient is 35.9 l/(mol cm). the depth of the cell is 5 mm. (b) what is the %t? (7) calculate the absorbance of the solution if the transmitted light intensity is 70% of the initial light beam intensity