Electrons Emerge from an Electron Gun with a Speed of 2.0

question 69

Multiple Choice

Electrons emerge from an electron gun with a speed of 2.0 × 10⁶ m/s and then pass through a double-slit apparatus.Interference fringes with spacing of 2.7 mm are detected on a screen far from the double slit.What would the fringe spacing be if the electrons were replaced by neutrons with the same speed? (h = 6.626 × 10^-34 J ∙ s,m_electron = 9.11 × 10^-31 kg,m_neutron = 1.675 × 10^-27 kg)

• A)1.5 μm
• B)4.9 m
• C)0.93 nm
• D)1.2 km

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Definitions:

Standard Deviation

Standard deviation is a statistical measure of the dispersion or variability of returns for a given security or market index, indicating the degree of risk involved.

Risky Asset

Any asset that has a significant degree of risk associated with its expected returns, including the possibility of losing some or all of the original investment.

Expected Rate of Return

The average amount of profit or loss one can expect on an investment, based on historical data or estimations of future performance.

Variance

A statistical measurement of the spread between numbers in a data set, reflecting their volatility.