Advertisements
Advertisements
Question
Identify the part of the electromagnetic spectrum used in (i) radar and (ii) eye surgery. Write their frequency range.
Advertisements
Solution
Microwaves are used for the ‘Radar’ system. The frequency range of microwaves is from 1 GHz to 2 GHz and
(ii) Ultraviolet rays (UV rays) are used in eye surgery. The frequency range of UV rays are from 1015 to 1017 Hz
APPEARS IN
RELATED QUESTIONS
Name the radiations of wavelength just longer than 8 × 10-7m.
Name the waves produced by the changes in the nucleus of an atom.
50% of the X-ray coming from a Coolidge tube is able to pass through a 0.1 mm thick aluminium foil. The potential difference between the target and the filament is increased. The thickness of the aluminium foil that will allow 50% of the X-ray to pass through will be
X-ray from a Coolidge tube is incident on a thin aluminium foil. The intensity of the X-ray transmitted by the foil is found to be I0. The heating current is increased to increase the temperature of the filament. The intensity of the X-ray transmitted by the foil will be
(a) zero
(b) < I0
(c) I0
(d) > I0
Name the radiation which can be detected by thermopile.
Name the radiations used for the detection of fracture in bones.
Choose the correct option.
Earth’s atmosphere is richest in
A bat moving at 10 ms−1 towards a wall sends a sound signal of 8000 Hz towards it. On reflection, it hears a sound of frequency f The value of f in Hz is close to (speed of sound = 320 ms−1)
Name one radiation having the wavelength longer than the wavelength of these radiations.
Why can a microwave oven heat food?
