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12th Physics Chapter 8 Important Questions
12 ஆம் வகுப்பு இயற்பியல் பாடம் 8 முக்கியமான வினாக்கள்
12th Physics Chapter 8 Important - 2 Marks
- 1. Define work function of a metal. Give its unit. (MAY 22, MAR 23)
- 2. What is photoelectric effect? (JUNE 23)
- 3. Give the definition of intensity of light according to quantum concept and its unit.
- 4. How will you define threshold frequency? (AUG 21)
- 5. State deBroglie hypothesis.
- 6. Define stopping potential. (JULY 22,MAR25)
- 7. What is surface barrier?
- 8. Why we do not see the wave properties of a baseball?
- 9. What is Bremsstralung? (or) Braking radiation.
- 10. What is Photo voltaic cell? (SEP 20)
- 11. What are the uses of X-rays? (MAR 20, SEP 20)
- 12. Why electron is preferred over X-ray in microscope? (MAR 20)
- 13. Calculate the cut-off wavelength and cut-off frequency of x-rays from an x –ray tube of accelerating potential 20,000 V. (Example 8.9) (SEP 20, MAY 22,JUNE 24)
- 14. What will happen to the stopping potential in the following cases when;
(B) Intensity of incident ray is increased.
12th Physics Chapter 8 Important - 3 Marks
- 1. What is a photocell? Mention the different types of photocells.
- 2. A proton and an electron have same de Broglie wavelength. Which of them moves faster and which possesses more Kinetic energy?
- 3. List out the laws of photoelectric effect. (MAR 23, MAY 22)
- 4. Give the construction and working of photo emissive cell. (JULY 22,MAR 25)
- 5. Derive an expression for deBroglie wavelength of matter waves and electrons. (MAR 20,AUG 21, JUNE 24)
- 6. List out the characteristics of photons. (AUG 21, SEP 20, JULY 22, JUN 23,24)
- 7. Give the applications photocell. (MAR 25)
- 8. How do we obtain characteristic x-ray spectra? (MAY 22)
- 9. Calculate the momentum of an electron with kinetic energy 2𝑒𝑉. (Example 8.6(i)) (AUG 21, JUN 23)
- 10. A radiation of wavelength 300 nm is incident on a silver surface. Will photoelectrons be observed? (work function of silver = 4.7eV) work function of calcium = 3.20eV) (Exam 8.2) (MAR 25)
- 11. How many photons per second emanate from a 50mW laser of 640 nm? (Ex-1, CH-8) (MAR 24)
12th Physics Chapter 8 Important - 5 Marks
- 1. What do you mean by electron emission? Explain briefly various methods of electron emission.
- 2. Obtain Einstein‟s photo electric equation with necessary explanation. (SEP 20, JULY 22, MAR 24)
- 3. Briefly explain the principle and working of electron microscope.
- 4. Describe briefly Davisson Germer experiment which demonstrated the wave nature of electrons. (MAR 20, MAR 23)
வாசகர்களின் கருத்துக்களை அன்புடன் வரவேற்கின்றோம்.