Question
In absorption spectrum of $Na$ the missing wavelength $(s)$ are
✓
Answer
(c)
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
Two identical balls $A$ and $B$ are released from the positions shown in figure. They collide elastically on horizontal portion $MN$ . The ratio of the heights attained by $A$ and $B$ after collision will be : (neglect friction)
→In a biprism experiment using sodium light $\lambda = 6000\, Å$ an interference pattern is obtained in which $20$ fringes occupy $2\, cm$. On replacing sodium light by another source of wavelength $\lambda_2$ without making any other change $30$ fringes occupy $2.7\, cm$ on the screen. What is the value of $\lambda_2$?.......$\mathop A\limits^o $
→Product $(C)$ of the reaction is
→Consider a planet moving around a star in an elliptical orbit with period $T$. The area of the elliptical orbit is proportional to ...........
→A point object is placed at a distance of $25\, cm$ from a convex lens of focal length $20\, cm$. If a glass slab of thickness $'t'$ and refractive index $1.5$ is inserted between the lens and object, then image is formed at infinity. The thickness is....$cm$
→In the given circuit, the current $(I)$ through the battery will be $..........\,A$
→A car is moving on a horizontal circular road of radius $0.1 \,km$ with constant speed. If coefficient of friction between tyres of car and road is $0.4$, then speed of car may be ......... $m / s$ $\left(g=10 \,m / s ^2\right)$
→A point mass $M$ moving with a certain velocity collides with a stationary point mass $M / 2$. The collision is elastic and in one-dimension. Let the ratio of the final velocities of $M$ and $M / 2$ be $x$. The value of $x$ is
→Three rods $A, B$ and $C$ of thermal conductivities $K, 2\,K$ and $4\,K$, cross-sectional areas $A, 2\,A$ and $2\,A$ and lengths $2l, l$ and $l$ respectively are connected as shown in the figure. If the ends of the rods are maintained at temperatures $100^o\,C, 50^o\,C$, and $0^o\,C$ respectively, then the temperature $\theta$ of the junction is ......... $^oC$
→If threshold wavelength for sodium is $6800Å$ then the work function will be ............. $eV$
→