Electromagnetic Waves - SS2 Physics Past Questions and Answers - page 1
Which of the following electromagnetic waves has the shortest wavelength?
Radio waves
X-rays
Gamma rays
Visible light
Which property of electromagnetic waves determines their energy?
Wavelength
Frequency
Amplitude
Speed
In the electromagnetic spectrum, which type of waves has the highest frequency?
Infrared
Ultraviolet
Microwaves
Radio waves
Which statement about the electromagnetic spectrum is correct?
All electromagnetic waves travel at the same speed
Longer wavelength waves have higher energy
Infrared waves have a higher frequency than visible light waves
X-rays and gamma rays have the same wavelength.
Which of the following electromagnetic waves is used in communication technologies like Wi-Fi and Bluetooth?
Infrared waves
Ultraviolet waves
Microwaves
X-rays
Which of the following properties of electromagnetic waves determines their colour in the visible spectrum?
Wavelength
Frequency
Amplitude
Speed
Which type of electromagnetic waves is commonly used in medical imaging, such as X-rays and CT scans?
Infrared waves
Radio waves
Ultraviolet waves
Gamma rays
Explain the relationship between the wavelength and energy of electromagnetic waves. Provide examples to support your answer.
The wavelength and energy of electromagnetic waves are inversely proportional. This relationship is known as the wave-particle duality of light. According to the equation E = hc/λ, where E represents the energy, h is Planck's constant, c is the speed of light, and λ is the wavelength, as the wavelength increases, the energy decreases, and vice versa. For example, gamma rays have very short wavelengths and carry a high amount of energy, while radio waves have longer wavelengths and lower energy.
Describe the different regions of the electromagnetic spectrum and discuss their applications in various fields.
The electromagnetic spectrum consists of several regions, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Each region has unique properties and applications. Radio waves are used for communication and broadcasting. Microwaves are utilised in cooking, radar systems, and satellite communications.
Infrared radiation is used in night vision devices, remote controls, and thermal imaging. Visible light is the range of wavelengths our eyes can detect and is responsible for vision. Ultraviolet radiation has applications in sterilisation, fluorescence, and tanning beds. X-rays are used in medical imaging, security screening, and material analysis. Gamma rays have applications in cancer treatment and nuclear medicine.
Which of the following statements best describes the transverse nature of electromagnetic waves?
Electromagnetic waves oscillate in a direction parallel to their propagation
Electromagnetic waves oscillate in a direction perpendicular to their propagation
Electromagnetic waves oscillate in a circular motion
Electromagnetic waves do not exhibit any oscillation.