IGCSE Physics - Waves & The Electromagnetic Spectrum (2026 CH)

A wave source produces 3000 crests every minute. The wave has a speed of 300m/s. What is the wavelength of the wave?

• 0.10m
• 0.17m
• 6.0m
• 10.0m

An object is placed in front of a converging lens of focal length 15 cm. Which row describes the image of the object?

• A
• B
• C
• D

The water wave shown has a frequency of 4.0 Hz. What is the speed of the wave?

• 3.0 cm/s
• 12 cm/s
• 48 cm/s
• 72 cm/s

Which type of waves are produced by a television remote controller

• Infrared waves
• Radio waves
• Ultraviolet waves
• Visible light

The speed of light in air is 3.0 x 10^8 m/s. The critical angle for light in a transparent plastic material placed in air is 37°. What is the speed of light in the plastic material?

• 1.8 x 10^8 m/s
• 2.4 x 10^8 m/s
• 3.8 x 10^8 m/s
• 5.0 x 10^8 m/s

A sound wave travels from air into water. Which row describes what happens to the frequency and the wavelength of the wave?

• Frequency: decreases; Wavelength: increases

• Frequency: decreases; Wavelength: stays the same

• Frequency: stays the same; Wavelength: decreases

• Frequency: stays the same; Wavelength: increases

The horn of a ship makes a sound. The captain on the ship hears an echo from a cliff 4.0 s later. When the speed of sound is 340m/s, what's the distance between the cliff and the ship?

• 170 m

• 340 m

• 680 m

• 1360 m

The diagrams represent water waves in a tank. Which diagram represents a wave that changes speed?

• 
• 
• 
• 

A tank contains water. Ripples are produced on the surface of the water. Refraction is observed. What causes the ripples to refract?

• The cold water in the tank is replaced by warm water

• The ripples change speed as they move from deep to shallow water

• The ripples hit the wall of the tank

• The ripples pass through a narrow gap

An eclipse of the Sun happens when the Moon comes between the Earth and the Sun. Which statement is correct?

• Infrared radiation from the Sun disappears before visible light and ultraviolet radiation.

• Ultraviolet radiation from the Sun disappears before visible light and infrared radiation.

• Visible light from the Sun disappears before ultraviolet radiation and infrared radiation

• Infrared radiation, ultraviolet radiation and visible light from the Sun all disappear at the same moment.