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प्रश्न
Choose the correct option.
The EM wave emitted by the Sun and responsible for heating the Earth’s atmosphere due to greenhouse effect is
विकल्प
Infra-red radiation
X-ray
Microwave
Visible light
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उत्तर
Infra-red radiation
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संबंधित प्रश्न
Why are microwaves considered suitable for radar systems used in aircraft navigation?
To which part of the electromagnetic spectrum does a wave of frequency 5 × 1011 Hz belong?
What physical quantity is the same for X-rays of wavelength 10−10 m, red light of wavelength 6800 Å and radiowaves of wavelength 500 m?
Give a reason for the following:
Long-distance radio broadcasts use short-wave bands. Why?
Why are infra-red waves often called heat waves? Explain.
What do you understand by the statement, "Electromagnetic waves transport momentum"?
Arrange the following radiations in the order of their increasing wavelength:
X-rays, infrared rays, ratio waves, gamma ray and microwaves.
Name the region beyond the red end of the spectrum.
Name the radiations of wavelength just shorter than 4 × 10-7 m.
Name two electromagnetic waves of frequency smaller than that of violet light. State one use of each.
Give one use of gamma rays.
An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm Calculate the velocity of the wave.
Can X-rays be used for photoelectric effect?
Why is exposure to X-rays injurious to health but not exposure to visible light, when both are electromagnetic waves?
The energy of a photon of a characteristic X-ray from a Coolidge tube comes from
50% of the X-rays coming from a Coolidge tube are able to pass through a 0.1 mm thick aluminium foil. If the potential difference between the target and the filament is increased, the fraction of the X-rays passing through the same foil will be
For a given material, the energy and wavelength of characteristic X-rays satisfy
(a) E(Kα) > E(Kβ) > E(Kγ)
(b) E(Mα) > E(Lα) > E(Kα)
(c) λ(Kα) > λ(Kβ) > λ(Kγ)
(d) λ(Mα) > λ(Lα) > λ(Kα).
An X-ray tube operates at 40 kV. Suppose the electron converts 70% of its energy into a photon at each collision. Find the lowest there wavelengths emitted from the tube. Neglect the energy imparted to the atom with which the electron collides.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Name the scientist who discovered radio waves
To which regions of the electromagnetic spectrum do the following wavelengths belong:
(a) 250 nm
(b) 1500 nm
Name any two electromagnetic waves which have a frequency higher than that of violet light. State one use of each.
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)
Microwaves are electromagnetic waves with frequency in the range of.
The ozone layer absorbs
Radio waves of constant amplitude can be generated with.
All components of the electromagnetic spectrum in a vacuum have the same ______
Electromagnetic waves with wavelength
- λ1 is suitable for radar systems used in aircraft navigation.
- λ2 is used to kill germs in water purifiers.
- λ3 is used to improve visibility in runways during fog and mist conditions.
Identify and name the part of the electromagnetic spectrum to which these radiations belong. Also arrange these wavelengths in ascending order of their magnitude.
Which is the correct ascending order of wavelengths?
What is the wavelength range of electromagnetic radiation used in radio broadcast?
