Light of wavelength 496 nm is incident on a metal surface c…

Physics Ray Optics Mix MCQ (Single Correct)

Light of wavelength 496 nm is incident on a metal surface causing ejection of photoelectrons for which stopping potential is 1.5 volt, then –

The work function of the surface is 1 eV

De Broglie wavelength of fastest photoelectron is 100 nm

To move the fastest electron in a circle of radius 1m, perpendicular magnetic field B required is 4.1 × 10 –6 Tesla

This fastest electron if strikes zinc target can produce X-rays

Text Solution

Verified by Experts

The correct answer is:

CHECK THE SOLUTION.

(a, c)

K max = 1.5 eV

λ dB =

= 1 nm

E of incident photon = 2.5 eV

φ = 2.5 – 1.5 = 1 eV

qvB =

B = =

B =

= 4.13 × 10 –6 Tesla

X-rays are of order of 0.1 nm 12.4 KeV

Get practice questions, solutions, and test series in one place.

Share your experience with this question and solution.

Send your comment, doubt, correction, or feedback to admin.

What students say about this solution

No reviews yet. Be the first to write a review.