Questions
A laser beam can be focused on an area equal to the square of its wavelength. A He-Ne laser radiates energy at the rate of 1 mW and its wavelength is 632.8 nm. The intensity of focused beam will be
detailed solution
Correct option is B
Area through which the energy of beam passes=6.328×10−72=4×10−13m2∴ I=PA=10−34×10−13=2.5×109W/m2Similar Questions
Ratio of intensities of two waves are given by 4 : 1' Then the ratio of the amplitudes of the two waves is
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests