Question
A nucleus X of mass number 238 undergoes 3 α-decays
and 2 β⁻-decays successively. The mass number and atomic number of the resulting nucleus Y are:Solution
To determine the mass number and atomic number of the final nucleus after a series of nuclear decays, we apply the changes caused by each type of decay: Given: • Initial nucleus: X, mass number = 238, let atomic number = Z (not specified, but final options indicate it is probably Uranium-238, so Z = 92) Effect of 3 α-decays Each α-decay reduces: • Mass number (A) by 4 • Atomic number (Z) by 2 After 3 α-decays: • Mass number: 238 − (3 × 4) = 226 • Atomic number: 92 − (3 × 2) = 86 Effect of 2 β⁻-decays: Each β⁻-decay: • Converts a neutron into a proton • Atomic number increases by 1 • Mass number remains unchanged After 2 β⁻-decays: • Atomic number: 86 + 2 = 88 • Mass number: remains 226 Final result: • Mass number = 226 • Atomic number = 88
With reference to the role of the Union Public Service Commission, which of the following statements is/are correct?
1. Commission is concerne...
KK Venugopal, the 15th Attorney General of India, received the first extension in his tenure in which of the following years?
At a particular time during the day, owing to the position of the sun, a 6 feet tall man casts a shadow of 4 feet, whereas a pole next to the man casts ...
In the context of Bonds, consider the following statements:
1. Bond Prices fall when inflation increases
2. Bonds help in Capital Prese...
Who among the following was not associated with Indian National Congress?
Which one of the following chemical is used as food preservative?
The unitarist perspective assumes that:
Which Article of the Constitution of India deals with duties of Prime Minister as respects the furnishing of information to the President, etc.?
Which article of the Indian Constitution provides for the establishment of a High Court in each state?
Who has been selected to carry out the remaining three packages of Mongolia's first oil refinery project?
Relevant for Exams:
