MCQ
For which frequency of light, the human eye is most sensitive?
- A$55.405 \times 10^{14} Hz$
- B$95.405 \times 10^{14} Hz$
- ✓$5.405 \times 10^{14} Hz$
- D$79.405 \times 10^{14} Hz$
✓
Answer
Correct option: C.
$5.405 \times 10^{14} Hz$
Human eye is sensitive to light of wavelength $\rightarrow \lambda=5550$ angstrom.
So its frequency is $v =\frac{ c }{\lambda}$
$v=\frac{5550}{3 \times 10^8} \times 10^{-10}$
$v=5.405 \times 10^{14} Hz$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
An electric current flows along an insulated strip $PQ$ of a metallic conductor. The current density in the strip varies as shown in graph of figure. Which one of the following statements could explain this variation ?
→A conducting rod $AB$ of length $l = 1\,M$ is moving at a velocity $v = 4 \,m/sec$. Making an angle $30^o$ with it's length A uniform magnetic field $B = 2\,T$ exists in a direction perpendicular to plane of motion then
→In Young’s double-slit experiment, an interference pattern is obtained on a screen by a light of wavelength $6000 Å$, coming from the coherent sources $S_1$ and $S_2$. At certain point $ P $ on the screen third dark fringe is formed. Then the path difference $S_1P$ -$S_2P$ in microns is
→Reading of ammeter $A_1, A_2$ and $A_3$ will be respectively
→The temperature coefficient of resistance of a conductor is
A uniform conducting wire $ABC$ has a mass of $10\,g$. A current of $2\,A$ flows through it. The wire is kept in a uniform magnetic field $B = 2T.$ The acceleration of the wire will be
→What are the charges stored in the $1 \,\mu F$ and $2 \,\mu F$ capacitors in the circuit below, once the currents become steady?
→The current between B and D in the given figure is
There are two plane mirror with reflecting surfaces facing each other. The mirrors are moving with speed $v$ away from each other.$A$ point object is placed between the mirrors. The velocity of the $n$ -th image will be
→A potential difference of $2.5 \,V$ is applied across the faces of a germanium crystal plate. The face area of the crystal is $1 \,cm ^2$ and its thickness is $1.0 \,mm$. The free electron concentration in germanium is $2 \times 10^{19} \,m ^{-3}$ and the electron and holes mobilities are $0.33 \,m ^2 / s$ and $0.17 \,m ^2 / V$ s respectively. The current across the plate will be .......... $A$
→