Download App

Atoms — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsAtoms1 Mark
Question
According to the uncertainty principle for an electron, time measurement will become uncertain if which of the following is measured with high certainty?
✓

Answer

  1. Energy
Explanation:
According to the uncertainty principle,
$\triangle\text{E}.\triangle\text{t}>=\frac{\text{h}}{2\pi}.$
Thus the time measured will become uncertain if $\triangle\text{E}$ is measured with high certainty.

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 "M.C.Q (1 Marks)" 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 k line of singly ionised calcium has a wavelength of 393.3 nm as measured on earth. In the spectrum of one of the observed galaxies, this spectral line is located at 401.8 nm. The speed with which the galaxy is moving away from us, will be(a) 6480 km/s(b) 3240 km/s(c) 4240 km/sec(d)  None of these
       
→
Which crystal is used in the Davisson – Germer experiment?
→
A charged particle in a plasma trapped in a magnetic bottle leaks out after a millisecond. What is the total work done by the magnetic field during the time the particle is trapped?
→
1 Volt = _____________ style-type: lower- alpha;”>
→
A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle q, the reflected light will deviate from its original path by the angle(a) 2θ(b) 0°(c)  θ(d) 4θ
       
→
A glass convex lens $\left({\mu_{\mathrm{g}}}\right.= 1.5)$ has a focal length of $8 \ cm$ when placed in air. What would be the focal length of the lens when it is immersed in water $\left(\mu_{\mathrm{w}}=1.33\right)$
→
Three bulbs of 40W, 60W and 100W are arranged in series with 220V. Which bulb has minimum resistance(a) 40W(b) 60W(c) 100W(d) Equal in all bulbs
       
→
An external resistance $R$ is connected to a battery of $e.m.f. V$ and internal resistance $r.$ The joule heat produced in resistor $R$ is maximum when $R$ is equal to
→
An iron rod of volume $10^{-4} m^3$ and relative permeability $1000$ is placed inside a long solenoid wound with $5\ \text{turns/cm.}$ If a current of $0.5\ A$ is passed through the solenoid, then the magnetic moment of the rod is
→
Each atom of an iron bar $(5\ cm \times 1 \ cm \times 1 \ cm)$ has a magnetic moment $1.8 \times 10^{-23} Am^2.$  Knowing that the density of iron is $7.78 \times 10^3 kg^{-3} m$  atomic weight is $56$ and Avogadro's  number is $6.02 \times 10^{23}$  the magnetic moment of bar in the state of magnetic saturation will be
→