Related Questions

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?)
A 3086 lines/em
B 308600 lines/cm
C 324 x 106 lines/cm
D 432 x 106 lines/cm
E 2314 lines/cm
Quartz crystal is most commonly used in crystal oscillators because ___________
A It has superior electrical properties
B It is easily available
C It is quite inexpensive
D None of the above
The crystal oscillator frequency is very stable due to ___________ of the crystal
A Rigidity
B Vibrations
C Low Q
D High Q
If the crystal frequency changes with temperature, we say that crystal has ___________ temperature coefficient
A Positive
B Zero
C Negative
D None of the above
When the wavelength of incident X-rays increases, the angle of diffraction
A Decreases
B Increases
C Remains constant
D Shows no systematic variation
একক চিড়ের দরুন ফ্রনহফার অপবর্তনে চিড়-পুরুত্ব কমালে সন্নিহিত সর্বনিম্ন তীব্রতার অঞ্চল পূর্বের তুলনায়- (For Fraunhofer diffraction due to a single slit, if the slit width is decreased, the adjacent minima compared to before will-)
A দূরে চলে যাবে (move apart)
B কাছে চলে আসবে (come closer)
C একই অবস্থানে থাকবে (remain at the same position)
D শুরুতে কাছে আসবে পরে দূরে চলে যাবে (initially come closer and then move apart)
Break even point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost
A Only
B Plus variable cost
C Plus overhead cost
D Plus selling expenses
Joint fluid examination yield most appropriate detection of crystal
A MSU
B CPPD
C Uric acid
D Triple phosphate
E Ca-oxalate
Which Bollywood actor was honoured with the 24th Crystal Award at the world Economic Forum meeting in January 2018?
A Shahrukh Khan
B Aamir Khan
C Salman Khan
D Akshay Kumar
A characteristic property of crystal is its periodicity of structure.
A True
B False

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