MCQ
Mark out the incorrect statement:
- ✓A free neutron can transform itself into photon
- BA free proton can transform itself into neutron
- CIn beta minus decay, the electron originates from nucleus
- DAll of the above
✓
Answer
Correct option: A.
A free neutron can transform itself into photon
In beta minus decay, a neutron decays into a proton, an electron.
A free neutron is unstable, decaying to a proton, electron and antineutrino.
Inside a nucleus, a proton can transform into a neutron via inverse beta.
A free neutron is unstable, decaying to a proton, electron and antineutrino.
Inside a nucleus, a proton can transform into a neutron via inverse beta.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Two parallel beams of protons and electrons, carrying equal currents are fixed at a separation $d$. The protons and electrons move in opposite directions. $P$ is a point on a line joining the beams, at a distance $x$ from any one beam. The magnetic field at $P$ is $B$. If $B$ is plotted against $x$, which of the following best represents the resulting curve
→In a transistor $(\beta=50)$, the voltage across $5 \,k \Omega$ load resistance in collector circuit is $5 \,V$. The base current is ......... $mA$
→A meter bridge is set-up as shown, to determine an unknown resistance ' $X$ ' using a standard $10$ ohm resistor. The galvanometer shows null point when tapping-key is at $52 \ cm$ mark. The end-corrections are $1 \ cm$ and $2 \ cm$ respectively for the ends $A$ and $B$. The determined value of ' $X$ ' is
→An electromagnetic wave of intensity $50\,Wm^{-2}$ enters in a medium of refractive index $’ n’$ without any loss . The ratio of the magnitudes of electric fields, and the ratio of the magnitudes of magnetic fields of the wave before and after entering into the medium are respectively. Given by
→If cathode rays are projected at right angles to a magnetic field, their trajectory is
Why the current does not rise immediately in a circuit containing inductance
A rectangular coil of 300 turns has an average area of average area of 25 cm × 10 cm. The coil rotates with a speed of 50 cps in a uniform magnetic field of strength $4 \times 10^{-2} \mathrm{~T}$ about an axis perpendicular of the field. The peak value of the induced e.m.f. is (in volt)
→Intensity of light depends upon
Equal charges $q$ are placed at the four corners $A,\,B,\,C,\,D$ of a square of length $a$. The magnitude of the force on the charge at $B$ will be
→In a series $LCR$ current the voltage across resistance, capacitance and inductance is $10\, V$ each. If the inductor is short circuited, the voltage across the capacitor will be:-
→