physics

What is the work function of a metal if the threshold wavelength for it is 580 nm? If light of475 nm wavelength falls on the metal, what is its stopping potential?

• 1.0eV

• 0.75eV

• 0.48eV

• 1.02eV

A photon of wavelength 4 Å strikes an electron at rest and is scattered at an angle of 150° to its original direction. Find the wavelength of the photon after collision.

• 10.03 Å

• 4.045 Å

• 9.06 Å

• 6.03Å

Calculate the de Broglie wavelength of an electron having a kinetic energy of 1000 eV.Compare the result with the wavelength of x-rays having the same energy.

• 30 Å

• 31.85 Å

• 11.03 Å

• 29.04 Å

An electron has a speed of 500 m/s with an accuracy of 0.004%. Calculate the certainty withwhich we can locate the position of the electron.

• 23.23 m

• 3.033m

• 0.30 m

• 0.0364 m

A particle constrained to move along the x-axis in the domain 0 < x <L has a wave function y(x) = sin (npx/L), where n is an integer. Normalize the wave function and evaluate the expectation value of its momentum.

• √(2/L),0

• 2/L,0

• √(2/L),hk

• √(2/L),h^2 k^2