Skip to main content

The value of Planck's constant is 6.63 × 10^-34 Js. The velocity of light is 3.0 × 10^8 ~ms^-1. Which value is closest to the wavelength in…

NEET UG 2003 — Chemistry Physical Chemistry

2003mcqmedium

The value of Planck's constant is 6.63 ×10−34Js\times 10^{-34} \mathrm{Js}×10−34Js. The velocity of light is 3.0×3.0 \times3.0× 108 ms−110^8 \mathrm{~ms}^{-1}108 ms−1. Which value is closest to the wavelength in nanometers of quantum of light with frequency of 8×1015 s−18 \times 10^{15} \mathrm{~s}^{-1}8×1015 s−1 ?

Official previous-year question

Held on 30 Apr 2003 · Verified 9 Jul 2026.

Options

  1. A

    2×10−252 \times 10^{-25}2×10−25

  2. B

    5×10−185 \times 10^{-18}5×10−18

  3. C

    4×1014 \times 10^14×101

  4. D

    3×1073 \times 10^73×107

Did you get this right?

Sign in to track your attempts and accuracy.

Your note

Sign in to keep a private note on this question. Nothing you write is ever public.

NEET UG Physical Chemistry in other years

Physical Chemistry 2026Physical Chemistry 2025Physical Chemistry 2024Physical Chemistry 2023Physical Chemistry 2022Physical Chemistry 2021Physical Chemistry 2020Physical Chemistry 2019Physical Chemistry 2018Physical Chemistry 2017Physical Chemistry 2016Physical Chemistry 2015

More NEET UG Physical Chemistry questions

For the reaction 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), ΔH = -198 kJ. Which condition favours forward reaction?

2026medium

The unit of rate constant for a first-order reaction is:

2026easy

Among the following choose the ones with equal number of atoms. A. 212 g of $\mathrm{Na}_2 \mathrm{CO}_3(\mathrm{~s})$ [molar mass $=106 \mathrm{~g}$ ] B. 248 g of $\mathrm{Na}_2 \mathrm{O}$ (s) [molar mass $=62 \mathrm{~g}$ ] C. 240 g of $\mathrm{NaOH}(\mathrm{s})$ [molar mass $=40 \mathrm{~g}]$ D. 12 g of $\mathrm{H}_2(\mathrm{~g})$ [molar mass $=2 \mathrm{~g}$ ] E. 220 q of $\mathrm{CO}_2(\mathrm{q})$ [molar mass $\left.=44 \mathrm{~g}\right]$ Choose the correct answer from the options given below:

2025medium

For the reaction $\mathrm{A}(\mathrm{g}) \rightleftharpoons 2 \mathrm{~B}(\mathrm{~g})$, the backward reaction rate constant is higher than the forward reaction rate constant by a factor of 2500 , at 1000 K . [Given : $\mathrm{R}=0.0831 \mathrm{~L} \mathrm{~atm} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$ ] $\mathrm{K}_{\mathrm{p}}$ for the reaction at 1000 K is

2025medium

The standard heat of formation, in $\mathrm{kcal} / \mathrm{mol}^{\text {of }} \mathrm{Ba}^{2+}$ is : [Given : standard heat of formation of $\mathrm{SO}_4^{2-}$ ion (aq) $=-216 \mathrm{kcal} / \mathrm{mol}$, Standard heat of crystallisation of $\mathrm{BaSO}_4(\mathrm{~s})=-4.5 \mathrm{kcal} / \mathrm{mol}$, standard heat of formation of $\left.\mathrm{BaSO}_4(\mathrm{~s})=-349 \mathrm{kcal} / \mathrm{mol}\right]$

2025medium
View all Physical Chemistry questions

Other Chemistry topics for NEET UG

Organic Chemistry

474 questions

Inorganic Chemistry

441 questions

Keep practicing Physical Chemistry

Work through every NEET UG Physical Chemistry PYQ, year by year.

Browse all Chemistry topics