Questions in Dual Nature of Radiation and Matter

Select	Question
	A photon of energy 8 eV is incident on metal surface of threshold frequency $1.6 \times {10^{15}}Hz.$ The maximum kinetic energy of the photoelectrons emitted (in eV) (Take $h = 6 \times {10^{ - 34}}Js)$.
	An X-ray tube is operated at 50 kV. The minimum wavelength produced is
	Which of the following wavelength falls in X-ray region
	A metal block is exposed to beams of X-ray of different wavelength. X-rays of which wavelength penetrate most
	X-rays and gamma rays are both electromagnetic waves. Which of the following statements is true
	In producing X-rays a beam of electrons accelerated by a potential difference V is made to strike a metal target. For what value of V, X-rays will have the lowest wavelength of 0.3094 Å
	In radio theraphy, X-rays are used to
	Hydrogen atom does not emit X-rays because
	X-rays were discovered by
	X-rays are