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प्रश्न
What role dose infra-red radiation play in physical therapy?
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उत्तर
The molecules of CO₂, NH₃ and water which are present in most materials absorb infrared waves. Due to this, the molecules heat and heat their surroundings. Hence, their thermal motion increases. Medical instruments, such as the infrared lamp which is used in physiotherapy, work on this principle.
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संबंधित प्रश्न
State an additional use of the X-rays waves
Name the subjective property of light related to its wavelength.
What is the range of the wavelength of the following electromagnetic waves?
(a) Infrared.
State the approximate range of wavelength associated with visible light.
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation,
(a) the intensity increases
(b) the minimum wavelength increases
(c) the intensity remains unchanged
(d) the minimum wavelength decreases.
Name any two electromagnetic waves which have a frequency higher than that of violet light. State one use of each.
Name two sources of infrared radiation.
State three properties of ultra-violet radiation similar to visible light.
Choose the correct option.
Earth’s atmosphere is richest in
Identify the electromagnetic wave whose wavelength range is from about 10-3 m to about 10-1 m. Write one use of this.
