Question

Solution

Correct option is X-rays, being electromagnetic waves, always travel with the speed of light i.e., in vacuum. It is only the energy of the incident electrons (and, therefore, the energy of the emitted X-rays) that depends on the accelerating p.d. The speed of X-rays has nothing to do with this p.d., it is a characteristic only of the medium of propagation. Unlike the case of visible light, the speed of X-rays changes but little with a change in medium (the refractive index of different media for X-rays is very close to unity)

SIMILAR QUESTIONS

Q1

The minimum wavelength of X-rays emitted from an X-ray tube operating at a voltage of 104 volts is roughly equal to

Q2

The energy in monochromatic X-rays of wavelength 1 Å is roughly equal to

Q3

What is the unit of Planck’s constant?

Q4

What are the dimensions of Planck’s constant?

Q5

An X-rays tube produces X-rays whose shortest wavelength is 0.2475 Å. The operating voltage of the tube must be

Q6

X-rays can be diffracted from crystals like the diffraction of light from a grating. The crystal grating for X-rays has a grasting element

Q7

In the continuous part of the spectrum of X-rays the limiting frequency is

Q8

An X-ray photon has a wavelength of 0.02 Å. Its momentum is

Q9

The potential difference applied to an X-ray tube is increased. As s result, in the emitted radiation,

Q10

The operating voltage in an X-ray tube is 10 kV. The maximum energy of the emitted X-ray photons will be