Back to DUAL NATURE OF RADIATION AND MATTER

NEET UG PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER

1 Hard

1 of 1

Application +4 | -1

In a photoemissive cell with exciting wavelength

\lambda ,

the fastest electron has speed

v.

If the exciting wavelength is changed to

3\lambda /4,

the speed of the fastest emitted electron will be

View answer and explanation

Correct option: D

Greater than

v{\left( {4/3} \right)^{1/2}}

Option D (Greater than

v{\left( {4/3} \right)^{1/2}}

) is correct because decreasing the wavelength increases the photon energy, leading to a greater maximum kinetic energy and thus a greater speed.

More Questions from DUAL NATURE OF RADIATION AND MATTER

Practice All Chapter MCQs →

If the Broglie wavelengths associated with a proton and an

\alpha

- particle are equal, then the ratio of velocities of the proton and the

\alpha

- particle will be: If the wavelength of incident light changes from 400 nm to 300 nm, the stopping potential for photoelectrons emitted from a surface becomes approximately In photo-electric effect, when graph is plotted for stopping potential versus frequency of incident light, for different metals, then: The radiation corresponding to

3 \to 2

transition of hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of

3 \times {10^{ - 4}}\,T.

If the radius of the largest circular path followed by these electrons is 10.0 mm, the work function of the metal is close to The shortest wavelength of

X

-rays emitted from an

X

-ray tube depends on the Planck’s constant has the dimensions of