10 questions🇬🇧English
💡 Photoelectric Effect & Energy Levels – A-level
Physics · A-level — photons, work function, Einstein's equation, electronvolts and atomic line spectra
Make it your own private quiz and change anything you like
Questions
What is 1 electronvolt (1 eV) expressed in joules?
1.60 × 10⁻¹⁹ J
9.11 × 10⁻³¹ J
6.63 × 10⁻³⁴ J
1.60 × 10¹⁹ J
20s
What is meant by the work function of a metal?
Minimum energy to remove an electron from its surface
Energy to excite an atom to its first level
Energy carried by each incident photon
Maximum kinetic energy of an emitted electron
20s
Light above the threshold frequency shines on a metal. What happens if only its intensity is increased?
The threshold frequency of the metal decreases
Electrons are emitted after a shorter delay
Emitted electrons have a higher maximum kinetic energy
More electrons are emitted per second
20s
What is the energy of a photon of frequency 5.0 × 10¹⁴ Hz? (h = 6.63 × 10⁻³⁴ J s)
3.3 × 10⁻¹⁹ J
1.3 × 10⁻¹⁸ J
3.3 × 10⁻²⁰ J
7.5 × 10⁻¹⁹ J
30s
Photons of energy 3.5 eV strike a metal with work function 2.3 eV. What is the stopping potential?
1.2 V
2.3 V
5.8 V
3.5 V
30s
A metal has a work function of 6.63 × 10⁻¹⁹ J. What is its threshold frequency? (h = 6.63 × 10⁻³⁴ J s)
1.0 × 10¹⁴ Hz
1.0 × 10¹⁶ Hz
1.0 × 10⁻¹⁵ Hz
1.0 × 10¹⁵ Hz
30s
An electron in hydrogen falls from the −3.4 eV level to the −13.6 eV level. What is the energy of the emitted photon?
13.6 eV
3.4 eV
17.0 eV
10.2 eV
30s
Hydrogen atoms are excited to the n = 4 level. How many different photon energies can be emitted as they return to the ground state?
3
10
4
6
30s
Which observation provides evidence for the wave nature of electrons?
Photoelectric emission from a metal surface
Deflection of an electron beam by a magnetic field
Diffraction of electrons by a graphite film
Excitation of mercury atoms by electron collisions
30s
200 nm light hits a metal of work function 4.2 eV. Find the max KE of the photoelectrons. (h = 6.63 × 10⁻³⁴ J s, c = 3.00 × 10⁸ m s⁻¹)
10.4 eV
6.2 eV
1.5 eV
2.0 eV
60s