Consider a photon of continuous X-ray coming from a Coolidge tube. Its energy comes from

1.  the kinetic energy of the striking electron

2.  the kinetic energy of the free electrons of the target

3.  the kinetic energy of the ions of the target

4.  an atomic transition in the target

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

1.  will remain unchanged

2.  will be doubled

3.  will be halved

4.  will become four times the original

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

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

One of the following wavelengths is absent and the rest are present in the X-rays coming from a Coolidge tube. Which one is the absent wavelength?

1.  25 pm

2.  50 pm

3.  75 pm

4.  100 pm

50% of the X-ray coming from a Coolidge tube is able to pass through a 0.1 mm thick aluminum foil. If the potential difference between the target and the filament is increased, the fraction of the X-ray passing through the same foil will be

1.  0%

2.  < 50%

3.  50%

4.  > 50%

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

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 so as to increase the temperature of the filament. The intensity of the X-ray transmitted by the foil will be.

1.   zero

2.   < I₀

3.   I₀

4.   > I₀

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

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)