Home
Class 11
CHEMISTRY
A blube emits light of lambda = 4500 Å. ...

A blube emits light of `lambda = 4500 Å`. The bulb is rated as 150 watt and `8%` of the energy is emitted as light. Number of photons emitted by bulb per second is : `["Take" hc = 12400 eVÅ]`

Text Solution

Verified by Experts

Energy emitted per second by the bulb
`=150xx(8)/(100)J`
Energy of 1 photon `=(hc)/(lamda)=(6.626xx10^(-34)xx3xx10^(8))/(4500xx10^(-10))`
Let n photons be evolved per second.
`thereforenxx4.42xx10^(-19)=150xx(8)/(100)`
`n=27.2xx10^(18)`
Promotional Banner

Topper's Solved these Questions

  • ATOMIC STRUCTURE

    OP TANDON|Exercise Illustrations of Objective Question|33 Videos

  • ATOMIC STRUCTURE

    OP TANDON|Exercise Solved Examples|10 Videos

  • AROMATIC HYDROCARBONS (ARENES)

    OP TANDON|Exercise EXAMPLES|24 Videos

  • CHARACTERISATION OF ORGANIC COMPOUNDS

    OP TANDON|Exercise Passage-2|5 Videos

Similar Questions

Explore conceptually related problems

A bulb emits light of 4500 Å . The bulb is rated as 150 watt and 9 % of the energy is emited as light . How many photons are emitted by the bulb per second ?

A bulb emits light of wavelength 4500Å .The bilb is nrated as 150 and 8% of the energy is emmitted as light .How amny photon are emitted by the bulb per second?

A bulb lamp emits light of mean wavelength of 4500A . The lamp is rated at 150W and 8% of the energy appears as emitted light. How many photons are emitted by the lamp per second?

A lamp mainly emits light of wavelength lambda . The lamp is rated at P watt and 8% of the energy is emitted as visible light. (i) How many photons of light are emitted by the lamp per second? (ii) How many photons are falling per second on a square whose length of each side is a, held perpendicular to the incident photons at a distance r from the lamp.

A tube emits light of wavelength 5296 Å . The bulb is rated as 200 watt and 20% of the enrgy is converted into light . If the whole light emitted is allowed to fall on a metal surface having work function 3.00 xx 10^(-19)J calculate the no. of electrons ejected in 10s.

A 20 W lamp rated 10% emits light of wavelength y. Calculate the number of photons emitted by the lamp per second.