Tolong dijawab pake caranya ya :)

dik : m = 10 gram = 10 × 10^-3 kg
h (tinggi) = 4,5 m
h (planck) = 6,63 × 10^-34 js
g = 10 m/s^2
dit : lamda...?

v = akar 2gh
v = akar 2 × 10 × 4,5
v = akar 90
v = 9,48 m/s

lamda = h / m . v
lamda = 6,63 × 10^-34 / (10 × 10^-3) (9,48)
lamda = 6,63 × 10^-34 / 94,8 × 10^-3
lamda = 0,07 × 10^-31
lamda = 7 × 10^-33 m