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

In seismic exploration, why do S-waves not travel through the outer core of the Earth?

In a time-of-flight LIDAR measurement, a laser pulse returns from a target in 6.67 × 10^-6 s. If light speed is 3.0 × 10^8 m/s, what is the target distance?

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?

Total internal reflection (TIR) can occur when light travels from glass (n = 1.50) into air. Which condition must be satisfied for TIR to happen?

Intensity I of a wave is proportional to which combination of wave properties?

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?

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?

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

A plane wavefront crosses from air to glass at an angle. In terms of wavefronts, why does the beam refract at the boundary?

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