What is the diameter of the magnetar?

b. If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens ? the diameter of the moon is 3.48 xx 10^(6) m , and the radius of lunar orbit is 3.8 xx10^(8) m.

A boy is trying to start a fire by focusing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm.The diameter of the sum is 1.39xx10^9 m and its mean distance from the earth is 1.5xx10^11 m. What is the diameter of the sun's image on the paper?

What is the diameter of H_(2) atom?

The angular diameter of the sun is 1920''. If the distance of the sun from the earth is 1.5xx10^(11)m , what is the linear diameter of the sun?

The angular diameter of the sun is 1920''. If the distance of the sun from the earth is 1.5xx10^(9)m , what is the linear diameter of the sun?

The angular diameter of the sun is 1920''. If the distance of the sun from the earth is 1.5xx10^(12)m , what is the linear diameter of the sun?

The angle of an object is 18.2^(@) . What is the angular diameter of the object in radians?

Sound waves from a loudspeaker spread nearly uniformly in all directions if the wavelength of the sound is much larger than the diameter of the loudspeaker. (a) Calculate the frequency for which the wavelength of sound in air is ten times the diameter of the speaker if the diameter is 20 cm. (b) Sound is essentially transmitted in the forward direction if the wavelength is much shorter than the diameter of the speaker. Calculate the frequency at which the wavelength of the sound is one tenth of the diameter of the speaker described above. Take the speed of sound to be 340 m s^-1 .

You are given a thread and a metre scale. How will you estimate the diameter of the thread?