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Ashok0210

Asked: April 27, 2021In: Class 12 Physics

The energy flux of sunlight reaching the surface of the earth is 1.388 × 10³ W/m² . How many photons (nearly) per square metre are incident on the Earth per second? Assume that the photons in the sunlight have an average wavelength of 550 nm

Class 12 Physics CBSE and UP Board Dual Nature of Radiation and Matter Chapter-11 Exercise 11.5 NCERT Solutions for Class 12 Physics Chapter 11 Question-5

Ashok0210

Asked: April 27, 2021In: Class 12 Physics

Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. (a) Find the energy and momentum of each photon in the light beam, (b) How many photons per second, on the average, arrive at a target irradiated by this beam? (Assume the beam to have uniform cross-section which is less than the target area), and (c) How fast does a hydrogen atom have to travel in order to have the same momentum as that of the photon?

Class 12 Physics CBSE and UP Board Dual Nature of Radiation and Matter Chapter-11 Exercise 11.4 NCERT Solutions for Class 12 Physics Chapter 11 Question-4

Ashok0210

Asked: April 27, 2021In: Class 12 Physics

The work function of caesium metal is 2.14 eV. When light of frequency 6 ×10¹⁴ Hz is incident on the metal surface, photoemission of electrons occurs. What is the (a) maximum kinetic energy of the emitted electrons, (b) Stopping potential, and (c) maximum speed of the emitted photoelectrons?

Class 12 Physics CBSE and UP Board Dual Nature of Radiation and Matter Chapter-11 Exercise 11.2 NCERT Solutions for Class 12 Physics Chapter 11 Question-2

Ashok0210

Asked: April 27, 2021In: Class 12 Physics

Find the (a) maximum frequency, and (b) minimum wavelength of X-rays produced by 30 kV electrons.

Class 12 Physics CBSE and UP Board Dual Nature of Radiation and Matter Chapter-11 Exercise 11.1 NCERT Solutions for Class 12 Physics Chapter 11 Question-1

Ashok0210

Asked: February 24, 2021In: Class 12 Physics

A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at 22º with the horizontal. The horizontal component of the earth’s magnetic field at the place is known to be 0.35 G. Determine the magnitude of the earth’s magnetic field at the place.

Class 12 Physics CBSE and UP Board Magnetism and Matter Chapter-5 Exercise 5.10 NCERT Solutions for Class 12 Physics Chapter 5 Question 10

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