Rutherford's experiment on scattering of $\alpha-$particles showed for the first time that the atom has

Which of the following is basic in nature?

What will be the ratio of de-Broglie wavelengths of a proton and an $\alpha$-particle of the same energy?

For $x \in \mathbb{R}$,the range of $3 \cos (4x - 5) + 4$ lies in the interval

The magnetic flux near the axis and inside the air-core solenoid of length $60 \ cm$ carrying current $I$ is $1.57 \times 10^{-6} \ Wb$. Its magnetic moment will be (cross-sectional area of a solenoid is very small as compared to its length,$\mu_0 = 4\pi \times 10^{-7} \ SI \ units$). (in $A \ m^2$)

In the circuit element given here,if the potential at point $B$,$V_B = 0$,then the potentials of $A$ and $D$ are given as