The Coolidge Tube

Q.

Some important modifications were made to the Crooke's tube to make it a more efficient x ray source. Why was the coolant added to the anode plate?

1. None of the reasons stated here

2. Most of the kinetic energy of the electrons get converted into heat upon falling on the anode plate, turning it very hot.

3. The anode plate will radiate x rays more vigorously when the surface is cold

4. The liquid in the coolant increases the conductivity in the external circuit

Q.

In Coolidge tube electrons were ejected by the cathode because of which method:

1. Photo electric emission

2. Corona discharge

3. All of the above.

4. Thermionic emission

Q. Which of the following wavelength will be absent from the X-ray spectrum if the X-ray tube is operated at 40, 000 V?

1. $0.2A^{\circ }$
2. $1.0A^{\circ }$
3. $2.0A^{\circ }$
4. $0.5A^{\circ }$

Q.

Two discharge tubes have idential material structure and the same gas is filled in them. The length of one tube is 10 cm and that of the other tube is 20 cm. Sparking starts in both the tubes when th epotential difference between the cathode and the anode is 100 V. If the pressure in the shorter tube is 1.0 mm of mercury, what is the pressure in the longer tube?

Q.

The mean free path of electrons in th gas in a discharge tube is inversely proportional to the pressure inside it. The Crookes dark space occupies half the length of the discharge tube when the pressure is 0.02 mm of mercury. Estimate the pressure at which the dark space will fill the whole tube.

Q.

In Coolidge tube electrons were ejected by the cathode because of which method:

1. Thermionic emission

2. Photo electric emission

3. Corona discharge

4. All of the above.

Q.

Some important modifications were made to the Crooke's tube to make it a more efficient x ray source. Why was the coolant added to the anode plate?

1. Most of the kinetic energy of the electrons get converted into heat upon falling on the anode plate, turning it very hot.

2. The anode plate will radiate x rays more vigorously when the surface is cold

3. The liquid in the coolant increases the conductivity in the external circuit

4. None of the reasons stated here

Q. Which of the following wavelength will be absent from the X-ray spectrum if the X-ray tube is operated at 40, 000 V?

1. $0.2A^{\circ }$
2. $0.5A^{\circ }$
3. $1.0A^{\circ }$
4. $2.0A^{\circ }$

Q.

In Coolidge tube electrons were ejected by the cathode because of which method:

1. Thermionic emission

2. Photo electric emission

3. Corona discharge

4. All of the above.

Q. Which of the following wavelength will be absent from the X-ray spectrum if the X-ray tube is operated at 40, 000 V?

1. $0.2A^{\circ }$
2. $0.5A^{\circ }$
3. $1.0A^{\circ }$
4. $2.0A^{\circ }$