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Modern physics and semiconductors

21 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

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The work function of a photosensitive metal is $ϕ_{0} = 2.0 eV$ . What is the threshold wavelength $λ_{0}$ above which photoelectric emission CANNOT occur? (…
What is the de Broglie wavelength of an electron accelerated from rest through an electrostatic potential difference of $V = 100 volts$ ?
According to Bohr's model of the hydrogen atom, what is the radius of the second orbit ( $n = 2$ ), given that the radius of the ground state orbit ( $n = 1$ ) is $r_{1} = 0.529 \overset{˚}{A}$ ?
What is the energy required to excite an electron in a hydrogen atom from its ground state ( $n = 1$ ) to its first excited state ( $n = 2$ )?
The spectral lines of the Lyman series of atomic hydrogen lie in which region of the electromagnetic spectrum?
A radioactive sample has a half-life of $T_{1/2} = 10 days$ . If the initial activity of the sample is $A_{0} = 800 Bq$ , what will be its activity after $30 days$ ?
The binding energy per nucleon ( $E_{b} / A$ ) is maximum for which of the following atomic nuclei, indicating the highest nuclear stability?
What is the typical energy bandgap $E_{g}$ between the valence band and the conduction band for an intrinsic silicon semiconductor at room temperature?
To create an n-type extrinsic semiconductor from pure intrinsic silicon, which type of dopant impurity atoms must be added to the crystal lattice?
A Zener diode is specially designed with heavy doping to operate primarily in which biasing mode for DC voltage regulation?
What is the output frequency of the voltage ripple produced by a full-wave bridge rectifier fed by an alternating input voltage of frequency $50 Hz$ ?
Which of the following logic gates is classified as a universal gate because any Boolean logic function (AND, OR, NOT) can be constructed exclusively using it?
In the Einstein photoelectric equation $K_{ma x} = h ν - ϕ_{0}$ , if a graph is plotted with stopping potential $V_{s}$ on the vertical axis against frequency of incident light $ν$ on the horizontal a…
The energy equivalent of $1 atomic mass unit$ ( $1 u = 1.6605 \times 1 0^{- 27} kg$ ) is equal to which value?
What is the Boolean expression for the output $Y$ of a two-input NOR gate with inputs $A$ and $B$ ?
In a p-n junction diode under forward bias, how do the width of the depletion layer and the height of the potential barrier change?
What is the relation between the half-life $T_{1/2}$ and the radioactive decay constant $λ$ ?
When a nucleus of $_{92}^{238} U$ emits one $α$ -particle followed by two $β^{-}$ particles, what is the resulting daughter nucleus?
What is the wavelength of the photon emitted during the transition from $n = 3$ to $n = 2$ in a hydrogen atom (the first line of the Balmer series, $H_{α}$ )? (…
In a nuclear reactor, heavy water ( $D_{2} O$ ) or high-purity graphite is used as a moderator. What is the primary physical function of the moderator?
An electron and a proton have the same kinetic energy. What is the ratio of the de Broglie wavelength of the electron to that of the proton ( $λ_{e} / λ_{p}$ )?

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Modern physics and semiconductors

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