Which of the following is wrong ?a)Cathode rays have constant e/m ratiob)e/m ratio of anode rays is not constantc)e/m ratio of protons is not constantd)e/m ratio of b-particles is constantCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Cathode Rays and E/M Ratio

Cathode rays are streams of electrons that are emitted from the cathode of a high-vacuum tube. The e/m ratio of cathode rays is constant, which means that the ratio of the charge of an electron to its mass is always the same. This was discovered by J.J. Thomson in 1897 using a cathode ray tube.

Anode Rays and E/M Ratio

Anode rays are streams of positively charged particles that are emitted from the anode of a high-vacuum tube. The e/m ratio of anode rays is not constant, which means that the ratio of the charge of the particle to its mass varies. This is because anode rays are made up of different kinds of positively charged particles, such as protons, helium ions, and other atomic ions.

Protons and E/M Ratio

The e/m ratio of protons is not constant, which means that the ratio of the charge of a proton to its mass varies. This is because the charge of a proton is fixed, but its mass can change depending on the energy it has. Protons are positively charged particles that are found in the nucleus of an atom.

B-Particles and E/M Ratio

B-particles, also known as beta particles, are high-energy electrons or positrons that are emitted from the nucleus of an atom during radioactive decay. The e/m ratio of b-particles is constant, which means that the ratio of the charge of the particle to its mass is always the same.

Conclusion

Therefore, the correct option is C, as the e/m ratio of protons is not constant. The e/m ratio of cathode rays is constant, anode rays have a varying e/m ratio due to the presence of different types of positively charged particles, and b-particles have a constant e/m ratio.

Answer

E= charge on proton = 1.6×10^-19 C
m= mass of proton = 1.672×10^-27kg
e/ m ratio is always constant.

Answer

E /m ration of proton,b and cathode I.e. e is constant
but anode eats is not constant bcz it can be alpha proton ie charge is variable

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