# 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 traveling 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 traveling 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