Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
Given:-
Heat produced/second = Power (P) = 200 W
Potential in the X ray tube, V = 20 kV
We know
Power, P = VI
Here, V = potential difference
I = current
But `l = (n e)/t`
Where, e = charge on electron
t = time
n = no of electrons
`therefore P = (n eV)/t`
`⇒ 200 = (n eV)/t`
`⇒ (n e"/"t)V = 200`
`⇒ I = 200/V`
`⇒ I = 200/(20 xx 10^3) = 10 "mA"`
APPEARS IN
संबंधित प्रश्न
Identify the part of the electromagnetic spectrum which is:
produced by bombarding a metal target by high speed electrons.
Give a reason for the following:
It is necessary to use satellites for long-distance TV transmission. Why?
Why are infra-red waves often called heat waves? Explain.
What do you understand by the statement, "Electromagnetic waves transport momentum"?
Name the subjective property of light related to its wavelength.
A wave has a wavelength of 10-3 nm. Name the wave.
Name the waves used for taking photographs in dark.
Name of physical quantity which remains same for microwaves of wavelength 1 mm and UV radiations of 1600 Å in vacuum.
In a Coolidge tube, electrons strike the target and stop inside it. Does the target get more and more negatively charged as time passes?
Characteristic X-rays may be used to identify the element from which they are being emitted. Can continuous X-rays be used for this purpose?
Consider a photon of continuous X-ray and a photon of characteristic X-ray of the same wavelength. Which of the following is/are different for the two photons?
Find the maximum potential difference which may be applied across an X-ray tube with tungsten target without emitting any characteristic K or L X-ray. The energy levels of the tungsten atom with an electron knocked out are as follows.
| Cell containing vacancy | K | L | M |
| Energy in keV | 69.5 | 11.3 | 2.3 |
Name the scientist who discovered
X-rays
Name the radiation of the electromagnetic spectrum which is used for the following:
For taking photographs of the sky during the night and foggy conditions . Give the frequency range
Name two sources of infrared radiation.
Name the radiations used for the detection of fracture in bones.
Answer briefly.
Does an ordinary electric lamp emit EM waves?
The ozone layer absorbs
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?
