50% of the X-ray coming from a Coolidge tube is able to pass through a 0.1 mm thick aluminium foil. The potential difference between the target and the filament is increased. The thickness of aluminium foil, which will allow 50% of the X-ray to pass through, will be

1.   zero

2.   < 0.1 mm 

3.   0.1 mm

4.   > 0.1 mm

An \(X\text-\)ray tube produces a continuous spectrum of radiation with its short wavelength ending at  \(0.45~ \mathring{A}. \) What is the maximum energy of a photon in radiation?
1. \(27.6~ \text {keV} \)
2. \(25.5 ~\text {keV} \)
3. \(23.4 ~\text {keV} \)
4. \(25.1~ \text {keV}\)

The minimum wavelength of \(X\text-\)rays produced by \(30 ~\text{kV}\) electrons is:
1. \(0.0414~\text{nm}\)
2. \(0.0041~\text{nm}\)
3. \(0.1410~\text{nm}\)
4. \(0.4140~\text{nm}\)

The X-ray beam coming from an X-ray tube

1.  is monochromatic

2.  has all wavelengths smaller than a certain maximum wavelength

3.  has all wavelengths greater than a certain minimum wavelength

4.  has all wavelengths lying between a minimum and a maximum wavelength

For harder X-rays,

(a)  the wavelength is higher
(b)  the intensity is higher
(c)  the frequency is higher
(d)  the photon energy is higher

Choose the correct option 

1. (a), (b) 

2. (b), (c) 

3. (c), (d) 

4. (a), (d)

If the current in the circuit for heating the filament is increased, the cutoff wavelength

1.  will increase

2.  will decrease

3.  will remain unchanged

4.  will change

Electrons of mass m with de- Broglie wavelength λ fall on the target in an X-ray tube. The cut-off wavelength (λ_o) of the emitted X-ray is:

1.  ${\mathrm{\lambda }}_0=\frac{2{\mathrm{mc\lambda }}^2}{\mathrm{h}}$

2.  ${\mathrm{\lambda }}_0=\frac{2\mathrm{h}}{\mathrm{mc}}$

3.  ${\mathrm{\lambda }}_0=\frac{2{\mathrm{m}}^2{\mathrm{c}}^2{\mathrm{\lambda }}^2}{{\mathrm{h}}^2}$

4.  ${\mathrm{\lambda }}_0=\mathrm{\lambda }$

Consider a photon of continuous X-ray and a photon of characteristic X-ray of the same wavelength. Which of the following are different for the two photons?

(a) frequency
(b) energy
(c) penetrating power
(d) method of creation

Choose the correct option 

1. (a), (b) 

2. (b), (c) 

3. (d) 

4. (a), (d)

Visible light passing through a circular hole forms a diffraction disc of radius 0.1 mm on a screen. If X-ray is passed through the same set-up, the radius of the diffraction disc will be

1.  zero

2.  < 0.1 mm

3.  0.1 mm

4.  > 0.1 mm