# Worksheet: De Broglie Wavelengths

In this worksheet, we will practice deriving the de Broglie wavelength and calculating and interpreting its value for particles of known mass and velocity.

**Q1: **

Calculate the wavelength of an electron travelling at a velocity of m/s.

- A m
- B m
- C m
- D m
- E m

**Q2: **

What is the de Broglie wavelength of a 100 g baseball travelling at a velocity of 35.0 m/s?

- A m
- B m
- C m
- D m
- E m

**Q3: **

An electron has a mass of kg, and the mass of a proton (p) is kg. Assuming the electron and the proton move at the same speed of 300 m/s, which of the following is a true statement concerning the de Broglie wavelengths?

- A
- B
- C
- D

**Q4: **

Calculate the de Broglie wavelength for an electron moving at a speed of m/s. Use kg for the mass of an electron and J⋅s for the Planck constant.

- A m
- B m
- C m
- D m

**Q5: **

Calculate the de Broglie wavelength of a 0.1400 kg baseball moving at a speed of 40.00 m/s. Use a value of for Planck’s constant.

- A m
- B m
- C m
- D m

**Q6: **

An electron has a mass of kg, and the mass of a proton (p) is kg. Assuming the electron and the proton move at the same speed of 500 m/s, which of the following is a true statement concerning the de Broglie wavelengths?

- A
- B
- C
- D