Question
Frequency of photon having energy $66 eV$ is

Answer

(c) $E = h\nu$

$\Rightarrow \nu = \frac{E}{h} = \frac{{66 \times 1.6 \times {{10}^{ - 19}}}}{{6.6 \times {{10}^{ - 34}}}}$

$ = 16 \times {10^{15}}Hz$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A ball suspended by a thread swings in a vertical plane so that its magnitude of acceleration in the extreme position and lowest position are equal. The angle $(\theta)$ of thread deflection in the extreme position will be :
A uniform chain of length $3\, meter$ and mass $3\, {kg}$ overhangs a smooth table with $2\, meter$ laying on the table. If $k$ is the kinetic energy of the chain in joule as it completely slips off the table, then the value of ${k}$ is (Take $\left.g=10\, {m} / {s}^{2}\right)$
The internal resistance of a primary cell is $4\, ohm$. It generates a current of $0.2\, amp$ in an external resistance of $21\, ohm$. The rate at which chemical energy is consumed in providing the current is .............. $J/s$
Durring Searle's experiment, zero of the Vernier scale lies between $3.20 \times 10^{-2} m$ and $3.25 \times 10^{-2} m$ of the main scale. The $20^{\text {th }}$ division of the Vernier scale exactly coincides with one of the main scale divisions. When an additional load of $2 \ kg$ is applied to the wire, the zero of the Vernier scale still lies between $3.20 \times 10^{-2} m$ and $3.25 \times 10^{-2} m$ of the main scale but now the $45^{\text {th }}$ division of Vernier scale coincides with one of the main scale divisions. The length of the thin metallic wire is $2 m$. and its cross-sectional area is $8 \times 10^{-7} m ^2$. The least count of the Vernier scale is $1.0 \times 10^{-5} m$. The maximum percentage error in the Young's modulus of the wire is
The stationary wave produced on a string is represented by the equation $y = 5\cos (\pi x/3)\sin 40\pi \,t$. Where $x$ and $y$ are in cm and $t$ is in seconds. The distance between consecutive nodes is .... $cm$
The drift velocity of electrons in silver wire with cross-sectional area $3.14 \times 10^{-6}\,m ^2$ carrying a current of $20\,A$ is. Given atomic weight of $Ag =108$ , density of silver $=10.5 \times 10^3\,kg / m ^3..........\times 10^{-4} m / sec$.
A circular disc $X$ of radius $R$ is made from an iron plate of thickness $t,$ and another plate $y$ of radius $4R$ is made from an iron plate of thickness $\frac {t}{4}$. The ratio of moment of inertia $\frac {I_y}{I_x}$ is
An object is placed beyond the centre of curvature ${C}$ of the given concave mirror. If the distance of the object is ${d}_{1}$ from ${C}$ and the distance of the image formed is ${d}_{2}$ from ${C}$, the radius of curvature of this mirror is
In a resonance tube, the first resonance is obtained when the level of water in the tube is at $16\,cm$ from the open end. Neglecting end correction, the next resonance will be obtained when the level of water from the open end is .... $cm$
A $1000\,\, kg$ elevator rises from rest in the basement to the fourth floor, a distance of $20\,\, m$. As it passes the fourth floor its speed is $4\,m/sec$. There is a constant frictional force of $500\, N$. The work done by the lifting mechanism is