A train travels in a straight line at a constant speed of 30 m s⁻¹. The train's horn continuously emits sound of frequency 2400 Hz. A stationary observer stands next to the train track. The train approaches the stationary observer, passes him and then moves away. The speed of sound is 340 m s⁻¹. What is the maximum difference in the frequencies of the sound heard by the stationary observer?

Diffraction is a term used to describe one aspect of wave behaviour. What does diffraction make possible?

What is an approximate value for the speed of sound in air?

What is the relationship between the amplitude of a wave and its intensity?

Two horizontal parallel plate conductors are separated by a distance of 5.0 mm in air. The lower plate is earthed and…

The electric current in a wire may be calculated using the equation I = Anvq. Which statement is not correct?

A wire of cross-sectional area 5.0 × 10⁻⁶ m² is made of a metal of resistivity 50 × 10⁻⁸ Ω m. The potential differenc…