The waves that have maximum penetrating power to treat tumours are:
Gamma-rays have the highest energy and penetrating power among the options, making them suitable for treating tumors.
The electromagnetic rays used in radiotherapy to destroy cancer cells are:
X-rays are commonly used in radiotherapy due to their ability to target and destroy cancer cells.
The velocity of light in a diamond is:
The velocity of light in a diamond is \(1.2 \times 10^8 \, \text{m/s}\) due to its high refractive index of 2.5.
The group containing only electromagnetic waves is:
Light waves, radio waves, and microwaves are all types of electromagnetic waves.
The list that shows electromagnetic waves in order of increasing wavelength is:
Electromagnetic waves in order of increasing wavelength are Gamma-rays, X-rays, and Microwaves.
The type of electromagnetic wave used in security scanners at night is:
Infra-red waves are commonly used in security scanners at night due to their ability to detect heat.
A narrow beam of white light passes from air into the glass and is refracted. The wave characteristic remains unchanged in its:
When light is refracted, its frequency remains unchanged, while its speed and wavelength can change.
The type of waves that are used in the television remote controllers:
Infra-red waves are used in television remote controllers to send signals.
The colour that is least deviated by a prism:
Red light is least deviated by a prism because it has the longest wavelength among visible light colors.
The optical phenomenon in which the splitting of white light into seven distinct colours occur is called:
Dispersion is the phenomenon where white light is split into its constituent colors.
What causes the dispersion of white light when it passes through a prism?
Dispersion occurs due to refraction, where different colors of light bend at different angles as they pass through the prism.
What is dispersion of white light?
Dispersion of white light refers to the splitting of white light into its constituent colors, typically observed when light passes through a prism.
Which phenomenon is responsible for the formation of a rainbow inside a water droplet?
A rainbow inside a water droplet is formed due to dispersion and total internal reflection of light.
What type of waves are electromagnetic waves?
Electromagnetic waves are transverse waves, meaning their oscillations are perpendicular to the direction of energy transfer.
What is the speed of electromagnetic waves in a vacuum?
The speed of electromagnetic waves in a vacuum is approximately \(3 \times 10^8 \, \text{m/s}\).
Which of these obeys the laws of reflection, refraction, and diffraction?
Electromagnetic waves obey the laws of reflection, refraction, and diffraction.
What is the correct order of electromagnetic waves from longest to shortest wavelength?
The correct order of electromagnetic waves from longest to shortest wavelength is: Radio, microwave, infrared, visible, ultraviolet, X-ray, gamma ray.
How do optical fibers transmit signals?
Optical fibers transmit signals using the principle of total internal reflection.
Which device uses optical fibers to view inside human organs?
An endoscope uses optical fibers to view inside human organs.
What is the role of gamma rays in a CyberKnife?
Gamma rays in a CyberKnife are used for destroying cancerous cells with high precision.
Which device demonstrates the dispersion of light effectively?
A glass prism demonstrates the dispersion of light effectively by splitting white light into its constituent colors.
Which color of light bends the most in a prism?
Violet light bends the most in a prism because it has the shortest wavelength among visible light colors.
What property of a prism causes the dispersion of white light?
The dispersion of white light by a prism is caused by different refractive indices for different colors of light.
Which electromagnetic wave has the lowest frequency among the visible spectrum?
Red light has the lowest frequency among the visible spectrum.
What causes a rainbow to appear in the sky?
A rainbow appears in the sky due to the dispersion of sunlight by water droplets, acting like tiny prisms.
Which of the following can electromagnetic waves not carry?
Electromagnetic waves cannot carry electric charge; they carry energy, frequency, and momentum.
How do electromagnetic waves behave in a denser medium like glass or water?
In a denser medium like glass or water, the speed of electromagnetic waves decreases.
What happens to the frequency of an electromagnetic wave when it enters a new medium?
The frequency of an electromagnetic wave remains unchanged when it enters a new medium.
Which part of the electromagnetic spectrum has the longest wavelength?
Radio waves have the longest wavelength in the electromagnetic spectrum.
Which of the following has the shortest wavelength?
Gamma rays have the shortest wavelength in the electromagnetic spectrum.
Why are gamma rays considered hazardous?
Gamma rays are considered hazardous because they have high frequency and energy, which can damage living tissue.
Which type of electromagnetic wave is involved in photosynthesis and human vision?
Visible light is involved in photosynthesis and human vision.
Which electromagnetic wave is used in radio and TV communication?
Radio waves are used in radio and TV communication due to their ability to travel long distances.
What technology uses radio waves to produce 3D images of internal organs?
MRI (Magnetic Resonance Imaging) uses radio waves to produce 3D images of internal organs.
What type of wave is used in household remote controllers?
Infrared waves are used in household remote controllers to send signals.
What is the process where materials glow after absorbing UV light?
Fluorescence is the process where materials glow after absorbing UV light.
What is radiation therapy primarily used for?
Radiation therapy is primarily used to kill cancer cells.
Gamma rays are produced by:
Gamma rays are produced by the radioactive decay of unstable nuclei.
What makes Gamma rays more powerful than X-rays?
Gamma rays are more powerful than X-rays because they have higher energy.
Which scan involves injecting a radioactive substance and detecting gamma rays?
A PET scan involves injecting a radioactive substance and detecting gamma rays to create images of internal body functions.
Why are gamma rays used in structural testing of metals?
Gamma rays are used in structural testing of metals because they can penetrate thick materials and reveal internal defects.