2027 Cohort EMS & Waves MCQs

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 ligh 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 frquencyand the wavelenght 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 ship makes a sound. The captain on the ship hears echo from a cliff 4.0s later. When the speed of sound is 340m/s, whats the distance between the cliff and the ship?

• A)170m
• B)340m
• C)680m
• D) 1360m

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

• A
• B
• C
• D

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

• A) the cold water in the tank is replaced by warm water
• B)The ripple change speed as they move from deep to shallow water
• C) the ripples hit the wall of the tank
• D) 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?

• A. Infrared radiation from the Sun disappears before visible light and ultraviolet radiation.
• B.Ultraviolet radiation from the Sun disappears before visible light and infrared radiation.
• C.Visible light from the Sun disappears before ultraviolet radiation and infrared radiation
• D.Infrared radiation, ultraviolet radiation and visible light from the Sun all disappear at the same moment.