Home
Class 12
PHYSICS
Find the energy stored in a 60cm length ...

Find the energy stored in a 60cm length of a laser beam operating at 6mW.

Text Solution

Verified by Experts

Here, `l=60cm=0.6m,P=6mW=6xx10^-3W`.
Time taken by the laser beam to move through a
distance `l(=60cm)`is
`t=l/c=0.60/(3xx10^8)=2xx10^-9s`
The energy contained in the 60 cm length of laser
beam is
`U=Pt=(6xx10^-3W)xx(2xx10^9s)`
`=12xx10^-12J`
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC WAVES

    PRADEEP|Exercise Solved Example|4 Videos

  • ELECTROMAGNETIC WAVES

    PRADEEP|Exercise (I) Conceptual problems|1 Videos

  • ELECTROMAGNETIC INDUCTION & ALTERNATING CURRENT

    PRADEEP|Exercise Multiple Choice Questions|1 Videos

  • ELECTRONIC DEVICES

    PRADEEP|Exercise Fill in the Blanks|1 Videos

Similar Questions

Explore conceptually related problems

Find the energy stored in a 90cm length of a laser beam operating at 10mW.

Find the energy stored in a 60 cm length of a laser beam operating at 4 m W.

(i) Find the energy stored in a 90 cm length of a laser beam operating at 6 mW . (ii) Find the amplitude opf electric field in a parallel beam of light of intensity 17.7 W//m^(2) .

(a) Find the energy stored in a 90 cm length of a laser beam operating at 5mW . (b) Find the amplitude of the electric field in a parallel beam of light of intensity 8.85 W..m^(2) .

Find energy stored in a 30 cm length of a laser beam operating at 6 mW.

There is a source of leaser beam whose power is 3 m W. Energy stored in 90 cm length of this laser beam is found to be n xx 10 ^(-12) J. what is the value of n ?

How many photons are emitted per second by a 5mW laser source operating at 632.8nm?

How many photons are emitted per second by a 5 mW laser source operating at 632.8 nm?

The energy stored in a soap bubble of diameter 6 cm and T = 0.04 N/m is nearly