1
KCET 2020
MCQ (Single Correct Answer)
+1
-0

Angular momentum of an electron in hydrogen atom is $$\frac{3 h}{2 \pi}$$ ($$h$$ is the Planck's constant). The KE of the electron is

A
4.35 eV
B
1.51 eV
C
3.4 eV
D
6.8 eV
2
KCET 2020
MCQ (Single Correct Answer)
+1
-0

A beam of fast moving alpha particles were directed towards a thin film of gold. The parts $$A, B$$ and $$C$$ of the transmitted and reflected beams corresponding to the incident parts $$A, B$$ and $$C$$ of the beam are shown in the adjoining diagram. The number of alpha particles in

KCET 2020 Physics - Atoms and Nuclei Question 6 English

A
$$B^{\prime}$$ will be minimum and in $$C^{\prime}$$ maximum
B
$$A^{\prime}$$ will be maximum and in $$C^{\prime}$$ minimum
C
$$A^{\prime}$$ will be minimum and in $$B^{\prime}$$ maximum
D
$$C^{\prime}$$ will be minimum and in $$B^{\prime}$$ maximum
3
KCET 2020
MCQ (Single Correct Answer)
+1
-0

Two protons are kept at a separation of $$10 \mathrm{~nm}$$. Let $$F_n$$ and $$F_e$$ the nuclear force and the electromagnetic force between them

A
$$F_e=F_n$$
B
$$F_e \gg F_n$$
C
$$F_e \ll F_n$$
D
$$F_e$$ and $$F_n$$ differ only slightly
4
KCET 2020
MCQ (Single Correct Answer)
+1
-0

During a $$\beta^{-}$$-decay

A
an atomic electron is ejected
B
an electron which is already present within the nucleus is ejected
C
a neutron in the nucleus decays emitting an electron
D
a proton in the nucleus decays emitting an electron
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