Advertisements
Advertisements
Question
What are ultraviolet radiations?
Advertisements
Solution
Ultraviolet radiations are electromagnetic waves that occur right after the violet end of the spectrum and have wavelengths shorter than the violet portion of the visible spectrum.
APPEARS IN
RELATED QUESTIONS
Give a reason for the following:
Long-distance radio broadcasts use short-wave bands. Why?
An X-ray beam can be deflected
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation,
(a) the intensity increases
(b) the minimum wavelength increases
(c) the intensity remains unchanged
(d) the minimum wavelength decreases.
The Kβ X-ray of argon has a wavelength of 0.36 nm. The minimum energy needed to ionize an argon atom is 16 eV. Find the energy needed to knock out an electron from the K shell of an argon atom.
Write the range of the wavelength of the following electromagnetic radiations:
(a) Infrared rays
(b) Ultraviolet rays
(c) γ -rays
Write one use of each of the above.
X-rays, gamma rays and microwaves travelling in a vacuum have ______.
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)
A car is moving towards a high cliff. The car driver sounds a horn of frequency f. The reflected sound heard by the driver has a frequency 2f. If v be the velocity of sound, then the velocity of the car, in the same velocity units, will be:
Choose the correct option related to wavelengths (λ) of different parts of the electromagnetic spectrum.
What is the wavelength range of electromagnetic radiation used in radio broadcast?
