Advertisements
Advertisements
प्रश्न
Answer briefly.
Why are microwaves used in radar?
Advertisements
उत्तर
Microwaves are used in radar systems for identifying the location of distant objects like ships, airplanes, etc.
APPEARS IN
संबंधित प्रश्न
How are infrared waves produced?
What role dose infra-red radiation play in maintain the Earth’s warmth
Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why?
The small ozone layer on top of the stratosphere is crucial for human survival. Why?
State an additional use of the X-rays waves
Why are infra-red waves often called heat waves? Explain.
What is the range of the wavelength of the following electromagnetic waves?
(a) Micro waves .
What is the range of the wavelength of the following electromagnetic waves?
(A) Radio waves.
Name the radiations of wavelength just shorter than 4 × 10-7 m.
Give one use of ultraviolet radiation.
Name the waves of wavelength nearly 0.1 nm.
Name three properties of ultraviolet radiations which are similar to visible light.
If the potential difference applied to the tube is doubled and the separation between the filament and the target is also doubled, the cutoff wavelength
Suppose a monochromatic X-ray beam of wavelength 100 pm is sent through a Young's double slit and the interference pattern is observed on a photographic plate placed 40 cm away from the slit. What should be the separation between the slits so that the successive maxima on the screen are separated by a distance of 0.1 mm?
Name the scientist who discovered Ultraviolet rays
State the name and the range of wavelength of the invisible electromagnetic waves beyond the red end of the visible spectrum.
Name the part of the electromagnetic spectrum which is:
Produced by bombarding a metal target with high electrons.
Name two sources of infrared radiation.
What is the wavelength of the wave whose frequency is 1012 Hz? Name the electromagnetic wave.
An e.m. wave exerts pressure on the surface on which it is incident. Justify.
An electron beam is accelerated by a potential difference V to hit a metallic target to produce X-rays. It produces continuous as well as characteristic X-rays. If λmin is the smallest possible wavelength of X-ray in the spectrum, the variation of log λmin with log V is correctly represented in:
The frequency of e. m waves which is best suited .to observed of radius 3 × 10–4 his of the order of
What is time period of the light for which the eye is most sensitive?
Why does microwave oven heats up a food item containing water molecules most efficiently?
Write two uses of the following radiation.
X-rays
Electromagnetic waves of wavelengths λ1, λ2 and λ3 are used in a radar system, in water purifiers and in remote switches of TV, respectively.
- Identify the electromagnetic waves.
- Write one source for each of them.
Which is the correct ascending order of wavelengths?
What happens when an electron collides with a positron?
