Advertisements
Advertisements
प्रश्न
A radio can tune in to any station in the 7.5 MHz to 12 MHz band. What is the corresponding wavelength band?
Advertisements
उत्तर
A radio can tune to minimum frequency, v1 = 7.5 MHz = 7.5 × 106 Hz
Maximum frequency, v2 = 12 MHz = 12 × 106 Hz
Speed of light, c = 3 × 108 m/s
Corresponding wavelength for v1 can be calculated as:
`lambda_1 = "c"/"v"_1`
= `(3 xx 10^8)/(7.5 xx 10^6)`
= 40 m
Corresponding wavelength for v2 can be calculated as:
`lambda_2 = "c"/"v"_2`
= `(3 xx 10^8)/(12 xx 10^6)`
= 25 m
Thus, the wavelength band of the radio is 40 m to 25 m.
APPEARS IN
संबंधित प्रश्न
Name the high energetic invisible electromagnetic waves which help in the study of the structure of crystals
Name the subjective property of light related to its wavelength.
What do you understand by the invisible spectrum?
Name the radiations of wavelength just longer than 8 × 10-7m.
Name the waves used for taking photographs in dark.
If the potential difference applied to the tube is doubled and the separation between the filament and the target is also doubled, the cutoff wavelength
The Kβ X-rays from certain elements are given below. Draw a Moseley-type plot of √v versus Z for Kβ radiation.
| Element | Ne | P | Ca | Mn | Zn | Br |
| Energy (keV) | 0.858 | 2.14 | 4.02 | 6.51 | 9.57 | 13.3 |
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.)
The short-wavelength limit shifts by 26 pm when the operating voltage in an X-ray tube is increased to 1.5 times the original value. What was the original value of the operating voltage?
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
When 40 kV is applied across an X-ray tube, X-ray is obtained with a maximum frequency of 9.7 × 1018 Hz. Calculate the value of Planck constant from these data.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
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.
-
- Calculate the speed of the wave.
- Name the medium through which it is traveling.
Answer briefly.
Does an ordinary electric lamp emit EM waves?
Solve the numerical problem.
Calculate the wavelength in nm of an X-ray wave of frequency 2.0 × 1018 Hz.
Name the e.m. waves which are suitable for radar systems used in aircraft navigation. Write the range of frequency of these waves.
The magnetic field of a beam emerging from a filter facing a floodlight is given by B0 = 12 × 10–8 sin (1.20 × 107z – 3.60 × 1015t) T. What is the average intensity of the beam?
Write two uses of the following radiation.
X-rays
Photons of an electromagnetic radiation has an energy 11 keV each. To which region of electromagnetic spectrum does it belong?
Give any two uses of infrared waves.
Choose the correct option related to wavelengths (λ) of different parts of the electromagnetic spectrum.
