EM radiation

All electromagnetic waves are classified as:

• Longitudinal waves
• Sound waves
• Transverse waves
• Mechanical waves

Which part of the electromagnetic spectrum is visible to the human eye?

• Ultraviolet
• Visible light
• Infrared
• X-rays

Which has a longer wavelength?

• Microwaves
• X-rays
• Gamma rays
• Ultraviolet rays

What device typically uses radio waves?

• Oven
• Radio
• Light bulb
• Ultrasound machine

UV light is commonly used for:

• Lighting homes
• Heating food
• Disinfecting water
• Viewing bones

Which electromagnetic waves have the shortest wavelengths and highest frequencies?

• Infrared rays
• Radio waves
• Visible light
• Gamma rays

Infrared radiation is commonly used for:

• Cooking in microwaves
• Radio broadcasting
• Treating skin diseases
• Dental X-rays

In a vacuum, all electromagnetic waves have the same:

• Wavelength
• Frequency
• Speed
• Amplitude

X-rays are mainly used to view:

• Muscle tissue
• Nerve cells
• Dense body tissues like bones
• Blood flow

The energy (E) of an X-ray with frequency 3 x 10¹⁷ Hz is:

• 2 x 10⁻¹⁶ J
• 1.989 x 10⁻¹⁶ J
• 6.63 x 10⁻¹⁷ J
• 9.9 x 10⁻¹⁸ J