NEET Physics MCQs

An electron-hole pair is formed when light of maximum wavelength 6000 $\mathop A\limits^ \circ$ is incident on the semiconductor. What is the band gap energy of the semiconductor?

($h = 6.62\; imes {10^{ - 34}}$ J-s)

The energy of an X-ray photon of wavelength $1\mathop A\limits^ \circ$ is

$\left( {h = 6.6 imes {{10}^{ - 34}}{\rm{J}} - {\rm{s}}} \right)$

The energy of an X-ray photon of wavelength $1\mathop A\limits^ \circ$ is

$\left( {h = 6.6 imes {{10}^{ - 34}}{\rm{J}} - {\rm{s}}} \right)$

A potential difference of $42,000\;volts$ is used in an $X$-ray tube to accelerate electrons. The maximum frequency of the $X$-raditions produced is

The energy gap of silicon is 1.14 eV. At what wavelength the silicon will stop to absorb the photon?

The ratio of SI. Unit of the CGS unit of Planck’s constant is

The ratio of SI. Unit of the CGS unit of Planck’s constant is

The frequency of a proton associated with an energy of 3.31 ev is (given $h = 6.62 imes {10^{ - 34}}\,Js$ )

The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600 nm, when it delivers the power of $3.3 imes {10^{ - 3}}$ watt will be $(h = 6.6 imes {10^{ - 34}}{\rm{Js)}}$