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Which of the following is the most common instrument for photographic recording of diffraction patterns?

Which of the following is the most common instrument for photographic recording of diffraction patterns? Correct Answer Debye-Scherrer powder camera

Diffracted x-ray beam can be detected photographically or by using a scintillation counter or Geiger tube. Debye-Scherrer powder camera is the most common instrument for photographic recording of diffraction patterns.

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একটি সমতল নিঃসরণ গ্রেটিং এ লম্বভাবে আলো আপতিত হচ্ছে। এতে সবুজ আলোর = λ=5400A° যে কোন একটি ক্রম, বেগুনী আলোর λ=4050A° পরবর্তী উচ্চক্রমের উপরে পর্দায় উপরি পতিত হচ্ছে। যদি অপবর্তন কোণ 30° হয়, তাহলে গ্রেটিং এ প্রতি cm এ রেখার সংখ্যা কত হবে?(The light is incident on a plane diffraction grating perpendicularly. The green line λ=5400A° with an order superimposes on the violet line λ=4050A° of the next higher order. If the angle of diffraction is 300, then how many lines are in the grating per cm?)
We can easily observe diffraction in sound waves in comparison to diffraction in light waves because