JEE Main 2021 (Online) 17th March Morning Shift | Atoms and Nuclei Question 97 | Physics

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

Which level of the single ionized carbon has the same energy as the ground state energy of hydrogen atom?

JEE Main 2021 (Online) 17th March Morning Shift

MCQ (Single Correct Answer)

-1

An electron of mass m and a photon have same energy E. The ratio of wavelength of electron to that of photon is : (c being the velocity of light)

$${1 \over c}{\left( {{{2m} \over E}} \right)^{1/2}}$$

$${1 \over c}{\left( {{E \over {2m}}} \right)^{1/2}}$$

$${\left( {{E \over {2m}}} \right)^{1/2}}$$

$$c{(2mE)^{1/2}}$$

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

-1

Calculate the time interval between 33% decay and 67% decay if half-life of a substance is 20 minutes.

40 minutes

60 minutes

13 minutes

20 minutes

JEE Main 2021 (Online) 16th March Evening Shift

MCQ (Single Correct Answer)

-1

The de-Broglie wavelength associated with an electron and a proton were calculated by accelerating them through same potential of 100 V. What should nearly be the ratio of their wavelengths? (m_p = 1.00727u m_e = 0.00055u)

41.4 : 1

(1860)² : 1

1860 : 1

43 : 1

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