Waves For Detection And Exploration (physics Only) (ht Only) (GCSE Physics)

Which of the following best explains why radio-astronomy arrays combine signals from widely spaced antennas (interferometry)?

A continuous sound source and an observer move relative to each other. Which best describes the Doppler effect?

Which of the following correctly compares radio waves and gamma rays used in exploration?

A wavefront diagram shows wavefronts compressed on one side of a moving source. What does this indicate for an observer on the compressed side?

Which detection method is most appropriate for mapping shallow archaeological ruins a few meters below ground with high spatial detail?

Which of the following correctly describes a transverse wave?

An ultrasonic pulse is sent vertically down into water and the echo from the seabed returns 0.40 s later. If the speed of sound in seawater is 1500 m/s, how deep is the seabed?

A ray of light goes from air (n ˜ 1.00) into glass (n = 1.50). If the angle of incidence is 30°, what is the angle of refraction (to nearest degree) using Snell’s law?

Why are higher frequencies (shorter wavelengths) sometimes NOT used for very deep seismic exploration?

A naval sonar emits a 20 kHz pulse and listens for the echo. If the sea sound speed is 1500 m/s, what is the wavelength of the sonar pulse?

A radar pulse is used to measure the distance to a metal ship. If the pulse round-trip time is 2.0 × 10^-3 s and the speed of microwaves is 3.0 × 10^8 m/s, what is the distance to the ship?