An Electron Microscope Operates with Electrons of Kinetic Energy 50

question 10

Multiple Choice

An electron microscope operates with electrons of kinetic energy 50.0 keV.What is the wavelength of these electrons? Assume this speed is not relativistic.(h = 6.63 x 10^-34 J*s,c = 3.00 x 10⁸ m/s,1 eV = 1.60 x 10^-19 J,and m_e = 9.11 x 10^-31 kg)

• A)9.28 x 10^-10 m
• B)7.14 x 10^-11 m
• C)5.49 x 10^-12 m
• D)2.75 x 10^-13 m

---

Definitions:

Principal

The original sum of money borrowed in a loan or the amount of the investment.

Rate

The percentage at which interest is charged on a loan or earned on an investment.

Term Deposit

A banking product where money is locked away for a certain period of time at a fixed interest rate.

Maturity

The time at which a financial instrument, investment, or insurance policy reaches its final value and the principal is repaid or returned.