JEE Main 2020 (Online) 8th January Morning Slot | Atoms and Nuclei Question 171 | Physics

The graph which depicts the results of Rutherford gold foil experiment with $$\alpha $$-particales is :
$$\theta $$ : Scattering angle
Y : Number of scattered $$\alpha $$-particles detected (Plots are schematic and not to scale)

JEE Main 2020 (Online) 8th January Morning Slot Physics - Atoms and Nuclei Question 172 English Option 1

JEE Main 2020 (Online) 8th January Morning Slot Physics - Atoms and Nuclei Question 172 English Option 2

JEE Main 2020 (Online) 8th January Morning Slot Physics - Atoms and Nuclei Question 172 English Option 3

JEE Main 2020 (Online) 8th January Morning Slot Physics - Atoms and Nuclei Question 172 English Option 4

JEE Main 2020 (Online) 7th January Evening Slot

MCQ (Single Correct Answer)

-1

Out of Syllabus

The activity of a radioactive sample falls from 700 s^–1 to 500 s^–1 in 30 minutes. Its half life is close to:

62 min

66 min

72 min

52 min

JEE Main 2020 (Online) 7th January Morning Slot

MCQ (Single Correct Answer)

-1

The time period of revolution of electron in its ground state orbit in a hydrogen atom is 1.6 $$ \times $$ 10^-16 s. The frequency of revolution of the electron in its first excited state (in s^-1) is :

5.6 $$ \times $$ 10¹²

1.6 $$ \times $$ 10¹⁴

7.8 $$ \times $$ 10¹⁴

6.2 $$ \times $$ 10¹⁵

JEE Main 2019 (Online) 12th April Evening Slot

MCQ (Single Correct Answer)

-1

Consider an electron in a hydrogen atom revolving in its second excited state (having radius 4.65 $$\mathop A\limits^o $$). The de-Broglie wavelength of this electron is :

6.6 $$\mathop A\limits^o $$

3.5 $$\mathop A\limits^o $$

9.7 $$\mathop A\limits^o $$

12.9 $$\mathop A\limits^o $$

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