Missing lines in a continuous spectrum reveal - Vidyadip

MCQ

Missing lines in a continuous spectrum reveal

A
Defects of the observing instrument
B
Absence of some elements in the light source
C
Presence in the light source of hot vapours of some elements
✓
Presence of cool vapours of some elements around the light source

✓

Answer

Correct option: D.

Presence of cool vapours of some elements around the light source

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

Explore more

More "MCQ" from Ray Optics→Ray Optics — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

The temperature of a wire of length 1 metre and area of crosssection $1 cm ^2$ is increased from $0^{\circ} C$ to $100^{\circ} C$. If the rod is not allowed to increase in length, the force required will be $\left(\alpha=10^{-5} /{ }^{\circ} C\right.$ and $\left.Y=10^{11} N / m ^2\right)$

If for two vector $\vec{A}$ and $\vec{B}$, sum $(\vec{A} \quad \vec{B})$ is perpendicular to the difference $\left(\begin{array}{ll}A & \vec{B}\end{array}\right)$. The ratio of their magnitude is

The $Sl$ unit of inductance, the henry, can be written as

Inertia is that property of a body by virtue of which the body is

What is the difference between soft and hard $X$-rays

Work done in raising a box depends on

Two coils have a mutual inductance $0.005 H$. The current changes in the first coil according to equation $I=I_0 \sin \omega t$, where $I_0=10 \mathrm{~A}$ and $\omega=100\ \pi\ \mathrm{radian} / \mathrm{sec}$. The maximum value of e.m.f. in the second coil is

Choke coil works on the principle of

In a purely resistive ac circuit, the current

While measuring the thermal conductivity of a liquid, we keep the upper part hot and lower part cool, so that