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

Identify the process and importance of ethical approval for conducting research.

Understand the fundamental principles of designing a research study, including the role of control, variables, and operational definitions.

Critically evaluate claims based on correlational data and understand the limitations of correlational methods, including the distinction between correlation and causation.

Identify independent and dependent variables in experimental designs.

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Definitions:

Variable Overhead

Costs that vary with the level of production output, such as utilities for a manufacturing plant, which increase with more production.

Labour Rate Variance

The difference between the actual cost of labor and its expected cost based on standards set for production.

Labour Efficiency Variance

The difference between the actual labor hours used in production and the standard hours expected, multiplied by the standard labor rate.

Standard Costing

A cost accounting method that uses standard costs—the expected costs of labor, material, and overhead—to compare against actual costs.