Answer:
here on the surface of moon the gravity decreases so the frequency of oscillation will also decrease
Step-by-step explanation:
As we know that frequency of oscillation of the simple pendulum is given as

here we know
g = acceleration due to gravity at the surface of the planet
L = length of the pendulum
Now we know that the pendulum is on the surface of earth then gravity is given as

now when same pendulum is taken to the surface of the moon then we have

so here on the surface of moon the gravity decreases so the frequency of oscillation will also decrease