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प्रश्न
Name the scientist who discovered Microwaves
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उत्तर
Hertz
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संबंधित प्रश्न
Give a reason for the following:
Long-distance radio broadcasts use short-wave bands. Why?
State the approximate range of wavelength associated with visible light.
When a Coolidge tube is operated for some time it becomes hot. Where does the heat come from?
State the name and the range of wavelength of the invisible electromagnetic waves beyond the red end of the visible spectrum.
Identify the part of the electromagnetic spectrum used in (i) radar and (ii) eye surgery. Write their frequency range.
State three properties of infrared radiations similar to that of visible light.
Choose the correct option.
How does the frequency of a beam of ultraviolet light change when it travels from air into glass?
Answer briefly.
Why light waves travel in a vacuum whereas sound waves cannot?
The magnetic field of a beam emerging from a filter facing a floodlight is given by B0 = 12 × 10–8 sin (1.20 × 107z – 3.60 × 1015t) T. What is the average intensity of the beam?
Below is an incomplete table showing the arrangement of electromagnetic spectrum in the increasing order of their wavelength. Complete the table:
| Gamma ray | X - ray | UV rays | Visible rays | Infrared | A | Radio waves |
- Identify the radiation A.
- Name the radiation used to detect fracture in bones.
- Name one property common to both A and Radio waves.
