Advertisements
Advertisements
Question
Why does microwave oven heats up a food item containing water molecules most efficiently?
Advertisements
Solution
The microwave oven heats up the food items containing water molecules most efficiently because the frequency of microwaves matches the resonant frequency of water molecules.
APPEARS IN
RELATED QUESTIONS
Name the parts of the electromagnetic spectrum which is
used as a diagnostic tool in medicine.
Write in brief, how these waves can be produced.
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?
What is the range of the wavelength of the following electromagnetic waves?
(a) Micro waves .
State the approximate range of wavelength associated with infrared rays.
What are ultraviolet radiations?
An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm.name the medium through which it is travelling
Which part of electromagnetic spectrum is used in radar systems?
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
X-ray incident on a material
(a) exerts a force on it
(b) transfers energy to it
(c) transfers momentum to it
(d) transfers impulse to it.
Heat at the rate of 200 W is produced in an X-ray tube operating at 20 kV. Find the current in the circuit. Assume that only a small fraction of the kinetic energy of electrons is converted into X-rays.
Name the scientist who discovered Ultraviolet rays
State three properties of infrared radiations similar to that of visible light.
Answer briefly.
Does an ordinary electric lamp emit EM waves?
The frequency of x-rays, y-rays and ultraviolet rays are respectively a, b and c. Then:-
In uranium (Z = 92) the K absorption edge is 0.107 Å and the Kα line is 0.126 Å, and the wavelength of the L absorption edge is ______.
Below is an incomplete table showing the arrangement of electromagnetic spectrum in the increasing order of their wavelength. Complete the table:
| Gamma ray | X - ray | UV rays | Visible rays | Infrared | A | Radio waves |
- Identify the radiation A.
- Name the radiation used to detect fracture in bones.
- Name one property common to both A and Radio waves.
Which part of the electromagnetic spectrum is known as the visible spectrum?
What is the nature of all electromagnetic waves?
What happens to wavelength as the frequency of electromagnetic radiation increases?
Which radiation has the longest wavelength and lowest frequency in the electromagnetic spectrum?
