Advertisements
Advertisements
Question
Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why?
Solution
With reference to X-ray astronomy, X-rays are absorbed by the atmosphere. However, visible and radio waves can penetrate it. Hence, optical and radio telescopes are built on the ground, while X-ray astronomy is possible only with the help of satellites orbiting the Earth.
APPEARS IN
RELATED QUESTIONS
What do you understand by the statement, "Electromagnetic waves transport momentum"?
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.
Can X-rays be used for photoelectric effect?
Moseley's Law for characteristic X-ray is √v = a(Z − b). Here,
A certain element emits Kα X-ray of energy 3.69 keV. Use the data from the previous problem to identify the element.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
If the operating potential in an X-ray tube is increased by 1%, by what percentage does the cutoff wavelength decrease?
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Define the term "Intensity" in the photon picture of electromagnetic radiation.
State three properties of infrared radiations similar to that of visible light.
Give one use of electromagnetic radiation in Ultraviolet radiation.
What is the wavelength of the wave whose frequency is 1012 Hz? Name the electromagnetic wave.
Answer briefly.
Give two uses of ultraviolet rays.
Answer briefly.
Give two uses of radio waves.
Which of the following is a tool used for separating the different color wavelengths from each other?
For television broadcasting, the frequency employed is normally
Arrange the following electromagnetic radiation in the ascending order of their frequencies:
X-rays, microwaves, gamma rays, radio waves
