IGCSE-Spectrum

Which type of waves are produced by a television remote controller

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

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.

An intruder alarm sensor detects that a person is warmer than his surrounding. Which type of electromagnetic wave does the sensor detects?

• infared
• radio
• ultraviolet
• visible light

Select the correct order of waves on the EMS from low to high energy

• Radio, Micro, Infra, Visible, Ultra, X-ray, Gamma

• Gamma, X-ray, Ultra, Vis, Infra, Micro, Radio

• Vis, Micro, Infra, Ultra, X-ray, Gamma, Radio

• Micro, Radio, Vis, Infra, Ultra, X-ray, Gamma

Which has the LONGEST wavelength and, therefore, the LOWEST frequency/energy

• Gamma Rays

• Ultraviolet

• Visible Light

• Infrared rays

How are Electromagnetic waves different from Mechanical waves?

• EM waves have very short wavelengths

• EM waves transmit energy instead of matter

• EM waves can travel through the vacuum of space (without particles)

• EM waves can change direction by reflection

Which of the following electromagnetic waves has the lowest frequency?

• gamma ray

• infrared wave

• visible light wave

• microwave

Which is true about the speed of radio waves compared to light waves? They are...

• less energy & frequency, but still the SAME speed as the speed of light (300,000,000 m/s)

• less energy & frequency, so LESS than the speed of light (300,000,000 m/s)

• smaller wavelength, so LESS than the speed of light (300,000,000 m/s)

• more energy & frequency, so MORE than the speed of light (300,000,000 m/s)

Wavelength and Frequency are related in that...

• they are always the same

• when one increases, the other decreases (inversely proportional)

• there is no correlation

• they both vary in an irregular pattern

High frequency in EM waves equals

• high energy and short wavelength

• high energy and long wavelength

• low energy and short wavelength

• low energy and long wavelength