Let K1 and K2 be the maximum kinetic energies of photo-electrons emitted when two monochromatic beams of wavelength $$\lambda$$1 and $$\lambda$$2, respectively are incident on a metallic surface. If $$\lambda$$1 = 3$$\lambda$$2 then :
Following statements related to radioactivity are given below :
(A) Radioactivity is a random and spontaneous process and is dependent on physical and chemical conditions.
(B) The number of un-decayed nuclei in the radioactive sample decays exponentially with time.
(C) Slope of the graph of loge (no. of undecayed nuclei) Vs. time represents the reciprocal of mean life time ($$\tau$$).
(D) Product of decay constant ($$\lambda$$) and half-life time (T1/2) is not constant.
Choose the most appropriate answer from the options given below :
The de Broglie wavelengths for an electron and a photon are $$\lambda$$e and $$\lambda$$p respectively. For the same kinetic energy of electron and photon, which of the following presents the correct relation between the de Broglie wavelengths of two ?
Match List-I with List-II :
|List - I||List - II|
|(a)||Ultraviolet rays||(i)||Study crystal structure|
|(c)||Infrared rays||(iii)||Sterilizing surgical instrument|
Choose the correct answer from the options given below :