Quantum Physics (HL IB Physics)

The graph shows the scattering of electrons due to diffraction by oxygen-16 nuclei.

Which point on the graph represents the first minimum?

Which graph shows how intensity I varies with angle θ when electrons are diffracted by a nucleus?

At which scattering angle is the maximum energy transferred to an electron by a photon during Compton scattering?

A photon of energy  and wavelength strikes a stationary electron and transfers a fraction of its energy as it scatters. The scattered photon has a wavelength of .

What is the speed of the recoiling electron?

A vacuum photocell is connected in series with a power supply, a variable resistor, and a sensitive ammeter. A voltmeter is connected in parallel across the photocell.

Monochromatic light of frequency f illuminates the cathode, which has a threshold frequency f₀. Photoelectrons are emitted and collected by the anode. A photocurrent is measured by the ammeter.

The potential difference across the photocell, V, is increased until the ammeter reads zero. 

Which of the equations below does not correctly relate the potential V at which the current decreases to zero to the threshold frequency f₀ and frequency f?

Alpha particles of mass m are accelerated from rest through a potential difference ΔV. Which of the following gives the de Broglie wavelength of the alpha particles as a result of the acceleration? 

Use the following data: 

• Planck's constant is h
• The magnitude of charge on an electron is e

In a Compton scattering event, incident X-rays have a wavelength of 0.0200 nm and scattered X-rays are found to have a wavelength of 0.0225 nm.

What is the kinetic energy of the recoiled electron and the angle of the scattered X-ray photon?

A beam of electrons with wavelength  are accelerated from rest by a potential difference of 200 V and another beam of electrons with wavelength  are accelerated from rest by a potential difference of 1800 V.

What is the value of ?