C Camera. I think this because you can make timelapses with cameras which makes it easy to see.
Answer:
b) the alpha particles were found to be attracted to the nucleus
Explanation:
I can’t answer without any graph options
Answer:
The wavelength is 754.2 nm.
Explanation:
Given that,
Diffraction pattern y= 1.35 mm
Width = 0.838 mm
Distance D= 75 cm
We need to calculate the wavelength
Using formula of diffraction pattern


Where, y = diffraction pattern
m = order
d = width
D = distance
Put the value into the formula



Hence, The wavelength is 754.2 nm.