A spectroscopic instrument can resolve two nearby wavelengths and… - Vidyadip

Question

A spectroscopic instrument can resolve two nearby wavelengths $\lambda$ and $\lambda+\Delta\lambda$ if $\frac{\lambda}{\Delta\lambda}$ is smaller than 8000. This is used to study the spectral lines of the Balmer series of hydrogen. Approximately how many lines will be resolved by the instrument?

✓

Answer

The range of Balmer series is 656.3nm to 365nm. It can resolve $\lambda$ and $\lambda+\Delta\lambda$ if $\frac{\lambda}{\Delta\lambda}=8000$
$\therefore$ No. of wavelength in the range $=\frac{656.3-365}{8000}=36$
Total no. of lines 36 + 2 = 38 [extra two is for first and last wavelength]

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 "2 Marks Questions" from Atoms→Atoms — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

The area of cross$-$section of the wider tube shown in is $900\ cm^2.$ If the boy standing on the. Piston weighs $45\ kg,$ find the difference in the levels of water in the two tubes.

Explain frequency modulation.

When $40\ kV$ is applied across an $X-$ray tube, $X-$ray is obtained with a maximum frequency of $9.7 \times 10^{18}Hz.$ Calculate the value of Planck constant from these data.

Whether the diffraction effects from a slit will be more clearly visible or less clearly, if the slit-width is increased?

A ball of superconducting material is dipped in liquid nitrogen and placed near a bar magnet.
i. In which direction will it move?
ii. What will be the direction of its magnetic moment?

The quantities of charge on the two conducting spheres of radius $4 \ cm$ and $7 \ cm$ are $50$0 micro coulombs and $60$ micro coulombs respectively. Calculate the loss in electrical potential energy when conductors are joined together.

The given inputs A, B are fed to a 2-input NAND gate. Draw the output wave form of the gate.

Write the expression for the resistivity of the conductor and explain each term of the expression.

An electron is not deflected while passing through any field. Is it possible that there is no magnetic field present at that place? Explain.

Explain how electric conduction becomes possible in metallic conductor and in electrolytic conductors.