Quantum Basics Practice

10 problems · instant feedback · full explanations

Energy comes in packets (photons), matter has wavelength, and some pairs of quantities can't both be sharp. Embrace the weirdness — it predicts perfectly.

Q1.
The quantum of light energy is called a:

Multiple choice · Easy

Q2.
What is the energy of a photon with frequency 5×10¹⁴ Hz? (h = 6.626×10⁻³⁴ J·s. Answer in J.)

Numerical answer (J) · Medium

Q3.
Wave-particle duality applies to:

Multiple choice · Easy

Q4.
The Heisenberg uncertainty principle limits simultaneous knowledge of:

Multiple choice · Medium

Q5.
Firing electrons one at a time through a double slit eventually produces:

Multiple choice · Medium

Q6.
What is the Compton wavelength of an electron? (h = 6.626×10⁻³⁴, m = 9.11×10⁻³¹ kg, c = 3×10⁸ m/s. Answer in m.)

Numerical answer (m) · Hard

Q7.
A blue photon carries more energy than a red photon.

True / False · Easy

Q8.
Quantum mechanics is vague and makes no precise predictions.

True / False · Medium

Q9.
What is the radius of hydrogen n=2 orbit? (a₀ = 0.529 Å. Answer in Å.)

Numerical answer (Å) · Hard

Q10.
Protons in the Sun fuse despite electrostatic repulsion thanks to:

Multiple choice · Hard

Quantum Basics Practice

Q1. The quantum of light energy is called a:

Q2. What is the energy of a photon with frequency 5×10¹⁴ Hz? (h = 6.626×10⁻³⁴ J·s. Answer in J.)

Q3. Wave-particle duality applies to:

Q4. The Heisenberg uncertainty principle limits simultaneous knowledge of:

Q5. Firing electrons one at a time through a double slit eventually produces:

Q6. What is the Compton wavelength of an electron? (h = 6.626×10⁻³⁴, m = 9.11×10⁻³¹ kg, c = 3×10⁸ m/s. Answer in m.)

Q7. A blue photon carries more energy than a red photon.

Q8. Quantum mechanics is vague and makes no precise predictions.

Q9. What is the radius of hydrogen n=2 orbit? (a₀ = 0.529 Å. Answer in Å.)

Q10. Protons in the Sun fuse despite electrostatic repulsion thanks to: