Which one of the following decay series is incorrect along with their half life ?
Uranium-235 to Lead-350 at 200 million years
Uranium-235 to Lead-350 at 200 million years option is correct.
This series is doubly wrong: the daughter product of the \(^{235}\!U\) decay chain is \(^{207}\!Pb\), not the non-existent lead-350 (lead's heaviest known isotope is around mass 214). The accepted half-life is \(7.04\times 10^{8}\) years, i.e. about 704 million years, not 200 Ma. It is the workhorse of U-Pb zircon geochronology precisely because that half-life covers most of geological time.
The other three couples are standard reference values: \(^{14}\!C\to{}^{14}\!N\) at 5,730 y (radiocarbon dating), \(^{40}\!K\to{}^{40}\!Ar\) at \(1.25\times 10^{9}\) y (K-Ar and Ar-Ar dating), and \(^{87}\!Rb\to{}^{87}\!Sr\) at ~48,800 Ma (Rb-Sr isochron dating of ancient rocks).
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Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
