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A laser beam has a wavelength of `6xx10^(-7)`m and aperture of `6xx10^(-2)`m. The beam is sent towards the moon which is at a distance of `4xx10^(8)`m

Monjur Alahi

A laser beam has a wavelength of `6xx10^(-7)`m and aperture of `6xx10^(-2)`m. The beam is sent towards the moon which is at a distance of `4xx10^(8)`m from the earth. Calculate (i) angular spread of the beam and (ii) the arel spread when it reaches the moon.


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Salim Ahmed Kawsar

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Correct Answer - (i)`1.22xx10^(-5)rad(ii) 2.381xx10^(7)`m

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Two wavelength of sodium light `590 nm` and `596 nm` are used, in turn, to study the diffraction taking placed at a single slit of aperture `2 xx 10^(

(a) If the width of each slit is comparable to the wavelength of light used, the interference pattern thus obtained in the double-slit experiment is modified by diffraction from each...

2 Answers 1 views
A `0.6 xx 10^(-3) W` laser is aimed at the Moon. The wavelength of emitted light is 600 nm and the laser beam spreads out of the source at a divergenc

Correct Answer - `5.7 xx 10^(4) m^(-2) s^(-1)`

2 Answers 1 views
A laser beam of wavelength `lambda_(1) = 5 xx 10^(– 7) m` strikes normally a blackened plate and produces a force of `10^(– 5) N`. Mass of the plate i

Correct Answer - `750 Ks^(-1)`

2 Answers 1 views
A laser beam has a power of 100 mW. It has an aperture of `5xx10^(-3)`m and emits a wavelength 6943 Å. The beam is focused with a lens of focal length

Correct Answer - `2.87xx10^(-10)m^(2),3.48xx10^(8)Wm^(-2)`

2 Answers 1 views
An astronaut approaching the moon sends a radio signal of frequency `5 xx 10^(3)` MHz towards moon to find the speed of his rocket . The frequency of

Correct Answer - `2.58 km s^(-1)`

2 Answers 1 views
Suppose a monochromatic X-ray beam of wavelength 100 pm is sent through a Young's double slit and the interference pattern is observed on a photograph

Correct Answer - `4 xx 10^(-7) m`

2 Answers 1 views
In the echo method of estimating distnces, a radar signa was sent towards the Mars. If the echo was received after 8 minute 20 second, how far wat the

Correct Answer - `7.5xx10^(10)m`

2 Answers 1 views
Calculate the radius of the first and second orbit of sodium atom `(Z=11)`. `(h=6.6xx10^(-34) J s, e=1.6xx10^(-19) C` and `m=9.1xx10^(-31) kg.)`

Correct Answer - `4.82xx10^(-12)m, 1.928xx10^(-1) m`

2 Answers 6 views
What is the solid angle subtended by the moon at any point of the Earth, given the diameter of the moon is 3474 km and its distance

Given: Diameter (D) = 3474 km ∴ Radius of moon (R) = 1737 km = 1.737 × 106 m Distance from Earth r = 3.84 × 108 m To find: Solid angle (dΩ) Formula: dΩ = \(\frac{dA}{r^2}\) Calculation: From formula, dΩ...

2 Answers 2 views
The time period of revolution of moon around the earth is 28 days and radius of its orbit is `4xx10^(5)` km. If `G=6.67xx10^(-11) Nm^(2)//kg^(2)` then

Correct Answer - `6.47xx10^(24)` kg

2 Answers 5 views

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