12th Physics monthly Test - 2 ( Dual Nature of Radiation and Matter )

St. Britto Hr. Sec. School - Madurai

12th Physics monthly Test - 2 ( Dual Nature of Radiation and Matter )-Aug 2020

Time : 1.30 Hours

Part - A

Generic 2 - Answer All Question

How will you define threshold frequency?
Define work function of a metal. Give its unit.

How does photocurrent vary with the intensity of the incident light?

What is photoelectric effect?

Give the definition of intensity of light and its unit.

State de Broglie hypothesis.

What is a photo cell? Mention the different types of photocells.

Why do metals have a large number of free electrons?

An electron and an alpha particle have same kinetic energy. How are the de Broglie wavelengths associated with them related?

A proton and an electron have same kinetic energy. Which one has greater de Broglie wavelength. Justify.

Write the expression for the de Broglie wavelength associated with a charged particle of charge q and mass m, when it is accelerated through a potential V.

Part - B

Generic 5 - Answer All Question

Explain how frequency of incident light varies with stopping potential.

Calculate the de Broglie wavelength of a proton whose kinetic energy is equal to 81.9 x 10^-15 J. (Given: mass of proton is 1836 times that of electron).
Explain the quantum concept of light.

How many photons per second emanate from a 50 m W laser of 640 nm?

When a 6000 \(\mathring { A } \) light falls on the cathode of a photo cell and produced photoemission. If a stopping potential of 0.8 v is required to stop emission of electron, then determine the (i) frequency of the light (ii) energy of the incident photon (iii) work function of the cathode material (iv) threshold frequency and
(v) net energy of the electron after it leaves the surface.

At the given point of time, the earth receives energy from sun at 4 cal cm^-2 min^-1 Determine the number of photons received on the surface of the Earth per cm² per minute. (Given : Mean
wavelength of sun light = 5500 \(\mathring { A } \))

Explain why photoelectric effect cannot be explained on the basis of wave nature of light.

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12th Physics monthly Test - 2 ( Dual Nature of Radiation and Matter )

St. Britto Hr. Sec. School - Madurai

12th Physics monthly Test - 2 ( Dual Nature of Radiation and Matter )-Aug 2020

Part - A

Generic 2 - Answer All Question

How will you define threshold frequency?

Define work function of a metal. Give its unit.

How does photocurrent vary with the intensity of the incident light?

What is photoelectric effect?

Give the definition of intensity of light and its unit.

State de Broglie hypothesis.

What is a photo cell? Mention the different types of photocells.

Why do metals have a large number of free electrons?

An electron and an alpha particle have same kinetic energy. How are the de Broglie wavelengths associated with them related?

A proton and an electron have same kinetic energy. Which one has greater de Broglie wavelength. Justify.

Write the expression for the de Broglie wavelength associated with a charged particle of charge q and mass m, when it is accelerated through a potential V.

Part - B

Generic 5 - Answer All Question

Explain how frequency of incident light varies with stopping potential.

Calculate the de Broglie wavelength of a proton whose kinetic energy is equal to 81.9 x 10-15 J. (Given: mass of proton is 1836 times that of electron).

Explain the quantum concept of light.

How many photons per second emanate from a 50 m W laser of 640 nm?

At the given point of time, the earth receives energy from sun at 4 cal cm-2 min-1 Determine the number of photons received on the surface of the Earth per cm2 per minute. (Given : Mean wavelength of sun light = 5500 \(\mathring { A } \))

Explain why photoelectric effect cannot be explained on the basis of wave nature of light.

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Calculate the de Broglie wavelength of a proton whose kinetic energy is equal to 81.9 x 10^-15 J. (Given: mass of proton is 1836 times that of electron).

At the given point of time, the earth receives energy from sun at 4 cal cm^-2 min^-1 Determine the number of photons received on the surface of the Earth per cm² per minute. (Given : Mean
wavelength of sun light = 5500 \(\mathring { A } \))