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प्रश्न
(a) Give a list of at least five radiations, in order of their increasing frequencies, which make up the complete electromagnetic spectrum.
(b) Which of the radiation mentioned by you in part (a) has the highest penetrating power.
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उत्तर
(a) Five radiations, in the order of their increasing frequencies are:
Infrared waves, Visible light, Ultraviolet, X-rays and Gamma rays.
(b) Gamma rays have the highest penetrating power.
संबंधित प्रश्न
What is the range of the wavelength of the following electromagnetic waves?
(a) Visible.
Name two electromagnetic waves of frequency smaller than that of violet light. State one use of each.
How are X-rays produced?
Moseley's Law for characteristic X-ray is √v = a(Z − b). Here,
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
Find the maximum potential difference which may be applied across an X-ray tube with tungsten target without emitting any characteristic K or L X-ray. The energy levels of the tungsten atom with an electron knocked out are as follows.
| Cell containing vacancy | K | L | M |
| Energy in keV | 69.5 | 11.3 | 2.3 |
Choose the correct option.
How does the frequency of a beam of ultraviolet light change when it travels from air into glass?
The frequency of e. m waves which is best suited .to observed of radius 3 × 10–4 his of the order of
Assertion (A): Ultraviolet radiations is scattered more as compared to the microwave radiations.
Reason (R): Wavelength of ultraviolet radiation is more than the wavelength of microwave radiation.
Name one radiation having the wavelength longer than the wavelength of these radiations.
