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Subject: Physics, asked on 1/3/18

Solution of c
Q. 1. Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW.
(c) How fast does a hydrogen atom have to travel in order to have the same momentum as that of the photon?

Subject: Physics, asked on 26/2/18

Si unit.of.intensity of radiation

Subject: Physics, asked on 26/2/18

how to find this energy changE??

Subject: Physics, asked on 25/2/18

On what factors does the number of emitted photoelectrons depends ?

Subject: Physics, asked on 25/2/18

Calculate value of h (planks constant) question is in the image
Q. Using the graph shown in the figure for stopping potential versus the incident frequency of photons, calculate Planck's constant.

Subject: Physics, asked on 25/2/18

Only underlined part of the q ans I need asap

Subject: Physics, asked on 24/2/18

A body cools at the ate of 0.50/C when it is 500C above surrounding temperature.The rate of cooling at excess temperature of 300C over surrounding temperature is
a) 30C/S
b) 0.1oc/s
c) 0.2​0c/s
d)0.30c/s

Subject: Physics, asked on 23/2/18

solve qsn 14 to 16 nd explan wherwvr neccessary ...it's emergency...nd solve OR part also

Subject: Physics, asked on 23/2/18

electron moving with velocity v and a photo has same de Broglie wavelength what will be the ratio of their energy values

Subject: Physics, asked on 23/2/18

Q.60. The human eye needs a minimum intensity of 10-10 Wm-2 to produce sensation of ight. If the are of the pupil is 10-6 m2 and the wavelength of incident light is 5600 Ao; What should be the minimum number of photons entering the pupil/sec to excite the sense of sight.

Subject: Physics, asked on 23/2/18

Solve this:
Q.57. A photosensitive material is exposed to electromagnetic radiation of wavelength λ
(i) longer than the threshold wavelength?
(ii) smaller than the threshold wavelength?
After approximately how much time will the photoelectric emission take place in each of cases? Give reason for your answer.
 

Subject: Physics, asked on 23/2/18

Q.55. Calculate the energy per proton and the average number of photons emitted per sec by a 5 mW source emitting radiations of frequency 3×1014 Hz.

Subject: Physics, asked on 23/2/18

Solve this:
Q.61. If the frequency of incident radiations is doubled, what change occurs in
(i) maximum kinetic energy of photoelectrons?
(ii) stopping potential?
Give reasons for your answer.

Subject: Physics, asked on 23/2/18

in a photocell placed 75 cm away from monochromatic source the stopping potential is 3 volt and photoelectric current is 20 milliampere. how will the value change if the source is brought closer to a distance of 25 cm

Subject: Physics, asked on 23/2/18

A proton and deutron have the same kinetic energy .find the ratio of the de broglie wavelength associated with the proton to that of deutron.

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