IIT-JEE Exam

Electrons with de-Broglie wavelength λ fall on the target in an X-ray tube. The cut-off wavelength of the emitted Xrays
is

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IIT-JEE Other Question

A small object of uniform density rolls up a curved surface with an initial velocity v.
It reaches up to a maximum height of
3v^2/4g
with respect to the initial position. The
object is
(A) ring (B) solid sphere
(C) hollow sphere (D) disc A student performs an experiment to determine the Young’s modulus of a wire, exactly 2 m long, by Searle’s method.
In a particular reading, the student measures the extension in the length of the wire to be 0.8 mm with an uncertainty of
±0.05 mm at a load of exactly 1.0 kg. The student also measures the diameter of the wire to be 0.4 mm with an
uncertainty of ±0.01 mm. Take g = 9.8 m/s2 (exact). The Young’s modulus obtained from the reading is