JEE Main 2021 (Online) 31st August Morning Shift | Atoms and Nuclei Question 67 | Physics

JEE Main 2021 (Online) 31st August Morning Shift

MCQ (Single Correct Answer)

-1

A sample of a radioactive nucleus A disintegrates to another radioactive nucleus B, which in turn disintegrates to some other stable nucleus C. Plot of a graph showing the variation of number of atoms of nucleus B versus time is :

(Assume that at t = 0, there are no B atoms in the sample)

JEE Main 2021 (Online) 31st August Morning Shift Physics - Atoms and Nuclei Question 67 English Option 1

JEE Main 2021 (Online) 31st August Morning Shift Physics - Atoms and Nuclei Question 67 English Option 2

JEE Main 2021 (Online) 31st August Morning Shift

MCQ (Single Correct Answer)

-1

A moving proton and electron have the same de-Broglie wavelength. If K and P denote the K.E. and momentum respectively. Then choose the correct option :

K_p < K_e and P_p = P_e

K_p = K_e and P_p = P_e

K_p < K_e an P_p < P_e

K_p > K_e and P_p = P_e

JEE Main 2021 (Online) 27th August Morning Shift

MCQ (Single Correct Answer)

-1

There are 10¹⁰ radioactive nuclei in a given radioactive element, its half-life time is 1 minute. How many nuclei will remain after 30 seconds? $$\left( {\sqrt 2 = 1.414} \right)$$

2 $$\times$$ 10¹⁰

7 $$\times$$ 10⁹

10⁵

4 $$\times$$ 10¹⁰

JEE Main 2021 (Online) 26th August Evening Shift

MCQ (Single Correct Answer)

-1

At time t = 0, a material is composed of two radioactive atoms A and B, where N_A(0) = 2N_B(0). The decay constant of both kind of radioactive atoms is $$\lambda$$. However, A disintegrates to B and B disintegrates to C. Which of the following figures represents the evolution of N_B(t) / N_B(0) with respect to time t?

[N_A (0) = No. of A atoms at t = 0

N_B (0) = No. of B atoms at t = 0]