science last sem Flashcards
describe the electromagnetic spectrum
A continuum of all possible frequencies of electromagnetic radiation.
Which of the following statements about the electromagnetic spectrum is true?
a. It encompasses all possible frequencies of electromagnetic radiation.
b. It consists solely of radio waves and microwaves.
c. It only includes visible light.
d. It is limited to X-rays and gamma rays.
a
Which type of electromagnetic radiation has the longest wavelength?
radio wave
Question: Which of the following devices uses infrared radiation?
a. X-ray machine
b. fluorescent light bulb
c. Microwave oven
d. Remote control
d
Which type of electromagnetic radiation has the highest energy?
Ultraviolet radiation
Which part of the electromagnetic spectrum is used for medical imaging to see inside the human body (succeeding with the highest frequency)?
X-rays
How does the interaction of electromagnetic waves with matter differ across the spectrum?
a. Electromagnetic waves do not interact with matter at all.
b. Electromagnetic waves always interact with matter in the same way regardless of their frequency.
c. Electromagnetic waves only interact with matter at specific wavelengths.
d. Electromagnetic waves interact with matter differently depending on their frequency and wavelength.
d
Explain why certain frequencies of electromagnetic radiation, such as gamma rays and X-rays, are used in medical imaging procedures.
a. Because they have the ability to penetrate through tissues and create detailed images of bones and internal organs.
b. Because they have the longest wavelengths, allowing them to travel deep into the body.
c. Because they are the only frequencies that can be detected by medical equipment.
d. Because they are easily absorbed by the human body, making them safe for medical use.
a
Discuss the potential risks and benefits associated with the use of ultraviolet (UV) radiation in everyday life.
a. UV radiation has the potential to cure all types of cancer without any side effects.
b. UV radiation can cause skin cancer but is also necessary for the production of vitamin D in the skin.
c. UV radiation is harmless and has no effect on human health.
d. UV radiation is only used in specialized scientific research and has no practical applications.
b
Analyze the role of radio waves in modern communication systems.
a. Radio waves are limited in their ability to carry information and are not suitable for communication.
b. Radio waves are only used for entertainment purposes and have no other applications.
c. Radio waves are used to transmit information over long distances through radio, television, and cellular networks.
d. Radio waves are primarily used for heating food in microwave ovens.
c
Evaluate the impact of technological advancements in understanding and utilizing the electromagnetic spectrum
a. Technological advancements have had no significant impact on our understanding or use of the electromagnetic spectrum.
b. Technological advancements have led to improved methods of communication, medical imaging, and scientific research.
c. Technological advancements have focused solely on harnessing visible light for practical applications.
d. Technological advancements have made it more difficult to study and utilize the electromagnetic spectrum.
b
In 1820, Hans Christian Oersted discovered that electricity could produce magnetism while conducting an experiment in his class by ___________.
a. consciously
b. assurance
c. serendipity
d. mischance
c
He discovered magnetism can produce electricity.
Michael Faraday
The unit of Magnetic flux was named after him.
Wilhelm Eduard Weber
He formulated the concept of photoelectric effect.
Albert Einstein
What happens to the speed of an electromagnetic wave as it enters a denser medium?
Decreases
If the charge particle is at rest, it will produce __________.
an electric field
In which direction do particles oscillate in a transverse wave?
Perpendicular to the direction of wave propagation
What is the relationship between frequency and wavelength of a wave?
Inversely proportional
In a transverse wave, what physical quantity does the distance between two consecutive trough represent?
Wavelength
Who conducted pioneering research on electromagnetism and discovered the principle of electromagnetic induction, which laid the foundation for the generation of electric currents by varying magnetic fields?
Michael Faraday
Hans Christian Oersted’s discovery of the deflection of a compass needle by an electric current led to the understanding of what phenomenon (electricity could produce _________)?
Magnetic field
Which scientist unified electricity and magnetism with his set of equations, known as Maxwell’s equation?
James Clerk Maxwell
Which of the following is an example of ionizing radiation?
a. Radio waves
b. Gamma rays
c. Ultraviolet radiation
d. X-rays
c
Which type of radiation is commonly used for communication purposes and is generally considered safe for human exposure?
a. Radio waves
b. Gamma rays
c. Ultraviolet radiation
d. X-rays
a
This type of wave behavior occurs when two or more waves overlap and combine.
Interference
This type of wave behavior occurs when a wave bounces off a surface that it cannot pass through.
Reflection
This type of wave behavior occurs when a wave enters a new medium at an angle.
Refraction
This type of wave behavior occurs when a wave bends as it moves around an obstacle or passes through a narrow opening.
Diffraction
These are disturbances that travel from one point to another without transporting the material or medium itself.
A wave
