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About how many times more intense will t...

About how many times more intense will the normal ear perceiver a sound of `10 ^(6) W //m^(2)` than one of `10^(9) W//m^(2)` ?

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Monochromatic light of wavelength 3000 Å is incident normally on a surface of area 4 cm^(2) . If the intensity of the light is 15 xx 10^(-2) W//m^(2) . The rate at which photons strike the surface is K xx 10^(13) photon/s. The value of K is _________.

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AAKASH SERIES-WAVE MOTION AND SOUND-PROBLEMS (LEVEL - II)
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  2. Two sound sources are moving in opposite directions with velocities v...

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  3. A 300 Hz source, an observer and wind are moving as shown in the figur...

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  4. A person standing on a road sends a sound signal to the driver of a ca...

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  5. A stationary sound sound 's' of frequency 334 Hz and a stationary ovs...

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  6. Spherical waves are emitted from a 1.0 W source in an isotropic non-ab...

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  7. The intensity of sound from a point source is 1.0 xx 10^-8 Wm^-2, at a...

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  8. Most people interpret a 9.0 dB increase in sound intensity level as a ...

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  9. About how many times more intense will the normal ear perceiver a soun...

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  10. The explosion of a fire cracker in the air at the a heigth of 40 m pro...

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  11. The sound level at a point 5.0 m away from a point source is 40 dB. Wh...

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  12. If the intensity of sound is doubled, by how many decibels does the so...

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  13. Sound with intensity larger than 120 dB appears painful to a person. A...

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  14. Two waves, each having a frequency of 100 Hz and a wavelength of 2.0 c...

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  15. Two waves, each having a frequency of 100 Hz and a wavelength of 2.0 c...

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  16. Two waves, each having a frequency of 100 Hz and a wavelength of 2.0 c...

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  17. Three component sinusoidal waves progressing in the same directions al...

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  18. A soldier walks towards a high wall taking 120 steps per minute. When ...

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  19. A man stands before a large wall at a distance of 50.0m and claps his ...

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  20. A road runs midway between two parallel rows of buildings. A motorist ...

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