CHARGE CURRENT NUMERICALS_CLASS10_PHYSICS

 CHARGE CURRENT NUMERICALS

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 SURFACE AREA VOLUME CYLINDER CONE CLASS 10 PRACTICE QUESTIONS

 

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CLASS 10 CIRCLES WORKSHEET SOLUTIONS SELINA CHAPTER 17 , 18

 CLASS 10 CIRCLES WORKSHEET SOLUTIONS SELINA

 

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CHAPTER 18 SOLUTIONS

CHAPTER 17 SOLUTIONS

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 PHOTOELECTRIC EFFECT CLASS 12 SOLUTIONS NOTES PDF

 

CLASS 12 

NCERT 

CHAPTER 11 

DUAL NATURE OF RADIATION AND MATTER SOLUTIONS

PHYSICS 

PHOTOELECTRIC EFFECT

 

The energy flux of sunlight reaching the surface of the earth is 1.388 × 10^3 W/m^2. 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.

The number of photons emitted per second by a Medium wave transmitter of 10 kW power, emitting radiowaves of wavelength 500 m. (b) The number of photons entering the pupil of our eye per second corresponding to the minimum intensity of white light that humans can perceive (10^10 W m^–2). Take the area of the pupil to be about 0.4 cm^2 , and the average frequency of white light to be about 6 × 10^14 Hz.

A 100W sodium lamp radiates energy uniformly in all directions. The lamp is located at the centre of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589 nm. (a) What is the energy per photon associated with the sodium light? (b) At what rate are the photons delivered to the sphere ?

 

 

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 BEATS (SOUND) NUMERICALS DERIVATION CONCEPT \ MAHARASHTRA BOARD CLASS 12 PHYSICS SOLUTION

 

 
A set of 8 tuning forks is arranged in a series of increasing order of frequencies. Each fork gives 4 beats per second with the next one and the frequency of last fork is twice that of the first. Calculate the frequencies of the first and the last fork.
[Ans: 28 Hz, 56 Hz]

A sonometer wire is stretched by tension of 40 N. It vibrates in unison with a tuning fork of frequency 384 Hz. How many numbers of beats get produced in two seconds if the tension in the wire is decreased by 1.24 N?
[Ans: 12 beats]