MCQ
$\pi $ mesons can be
  • A
    ${\pi ^ + }$ or ${\pi ^ - }$
  • B
    ${\pi ^ + }$ or ${\pi ^0}$
  • C
    ${\pi ^ - }$ or ${\pi ^0}$
  • ${\pi ^ + },\;{\pi ^ - }$ or ${\pi ^0}$

Answer

Correct option: D.
${\pi ^ + },\;{\pi ^ - }$ or ${\pi ^0}$
d
(d) $p \to {\pi ^ + } + n,$ $n \to p + {\pi ^ - }$ and $n \to n' + {\pi ^0}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A wavefront presents one, two and three HPZ at points A, B and C respectively. If the ratio of consecutive amplitudes of HPZ is 4 : 3, then the ratio of resultant intensities at these point will be
4 eV is the energy of the incident photon and the work function in 2eV. What is the stopping potential
In displacement method, there are two position of a lens for which we get clear image. First position of the lens is at $40 \,cm$ from object and second is at $80 \,cm$, the focal length of lens is ......... $cm$
Two plano-convex lenses each of focal length $10\,cm$ and refractive index $3/2$ placed as shown in fig. In space left, water  $\left( {\mu  = \frac{4}{3}} \right)$  is filled.

The whole arrangement is in air. The optical power of the system is .......$D$

Given below are two statements:

Statement $(I)$: When an object is placed at the centre of curvature of a concave lens, image is formed at the centre of curvature of the lens on the other side.

Statement $(II)$: Concave lens always forms a virtual and erect image.

In the light of the above statements, choose the correct answer from the options given below:

In a full wave rectifiers, input ac current has a frequency ‘n’. The output frequency of current is
The current in series $LCR$ circuit will be maximum when $\omega$ is
What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length $550 \,nm$ and slit of width $0.55\, mm$
If the ratio of intensities of two waves is 1 : 25, then the ratio of their amplitudes will be
The electromotive force of a primary cell is $2\, volts$. When it is short-circuited it gives a current of $4$ amperes. Its internal resistance in $ohms$ is