MCQ
Metallic solids are always opaque because
- ASolids effect the incident light
- ✓Incident light is readily absorbed by the free electron in a metal
- CIncident light is scattered by solid molecules
- DEnergy band traps the incident light
✓
Answer
Correct option: B.
Incident light is readily absorbed by the free electron in a metal
b
(b)Metallic solids are opaque because incident light is absorbed by the free electrons in a metal.
(b)Metallic solids are opaque because incident light is absorbed by the free electrons in a metal.
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
A particle executes linear simple harmonic motion with an ampilitude of $3\,cm$ . When the particle is at $2\,cm$ from the mean position , the magnitude of its velocity is equal to that of its acceleration. Then its time period in seconds is
→A student connects a long air cored-coil of manganin wire to a $100\,V\, D.C.$ supply and records a current of $25\,amp$. When the same coil is connected across $100\,V$, $50\,Hz\, a.c.$ the current reduces to $20\,A$, the reactance of the coil is....$\Omega $
→Surface tension of a liquid is found to be influenced by
In a transistor
Haloform reaction is characteristic of
Select the correct statements from the following
A uniform but time-varying magnetic field $B(t)$ exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point $P$ at a distance $r$ from the centre of the circular region
→A rod of length $2 cm$ makes an angle $\frac{2 \pi}{3}$ rad with the principal axis of a thin convex lens. The lens has a focal length of $10 cm$ and is placed at a distance of $\frac{40}{3} cm$ from the object as shown in the figure. The height of the image is $\frac{30 \sqrt{3}}{13} cm$ and the angle made by it with respect to the principal axis is $\alpha$ rad. The value of $\alpha$ is $\frac{\pi}{n} rad$, where $n$ is. . . . .
→The tension of a stretched string is increased by $69\%$. In order to keep its frequency of vibration constant, its length must be increased by .... $\%$
→A horizontal heavy uniform bar of weight $W$ is supported at its ends by two men. At the instant, one of the men lets go off his end of the rod, the other feels the force on his hand changed to
→