Related Questions

What is the wavelength of visible spectrum?
A 8500 - 9800 angstrom
B 7800 - 8000 angstrom
C 3900 - 7600 angstrom
D 1300 - 3000 angstrom
একটি ধাতব তলে λ তরঙ্গদৈর্ঘ্যের একবর্ণী আলোকরশ্মি আপতিত হলে ফটো-ইলেক্ট্রন নির্গত হয় এবং এক্ষেত্রে বিভবের মান 3Vo একই তলে যখন 2λতরঙ্গদৈর্ঘ্যের একবর্ণী আলো আপতিত হয়, তখন নিবৃত্তি বিভবের মান Vol ফটো-ইলেক্ট্রন নির্গত হওয়ার জন্য ঐ তলটির সূচন তরঙ্গদৈর্ঘ্যের মান নির্ণয় কর।(A monochromatic light of wavelength λ is incident on a metallic surface then ejects photo-electron and the value of stopping potential is 3Vo. When the same surface is illuminated by a light of wavelength 2λ., the stopping potential becomes Vo. Calculate the threshold wavelength for this surface to eject photo electrons.)
A 6λ
B 8λ
C 4λ3
D λ
E 4λ
The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from:
A 10-10 to 106 m
B 10-8 to 106 m
C 10-10 to 1010 m
D 10-8 to 108 m
RH রিডবার্গ ধ্রুবক হলে, হাইড্রোজেন বর্ণালির বামার সিরিজের ২য় লাইনের তরঙ্গদৈর্ঘ্য কত হবে? ( If RH is the Rydberg constant, what will be the wavelength of the 2nd line in the Balmer series of hydrogen spectrum?)
A 36RH5
B 163RH
C 3RH16
D 536RH
124λ তরঙ্গদৈর্ঘ্যের এক রঙা এক্সরে একটি কার্বণ ব্লক দ্বারা বিক্ষিপ্ত হয়। 180° তে এক্সবের বিক্ষিপ্ত বিকিরণের তরঙ্গদৈর্ঘ্যের মান নির্ণয় কর।(A monochromatic X-rays of wavelength 0.124λ is scattered by a carbon block. Find the wavelength of X-rays scattered through 180°) 
A 0.0484 λ
B 0.1724 λ
C 0.0756 λ
D 0.0242 λ
E 0.0968 λ
Only the moon was visible . (Negative)
A The moon was not visible .
B The moon was not invisible .
C Nothing but the moon was visible .
D None but the moon was visible .
Neither the moon nor the stars --- visible last night. The verb to fill in the gap should be ---
A was
B were
C are
D had been
Sentence Correction: Choose the answer that should replace the quotation part. The psychologist William James believed that facial expressions not only provide a visible sign of an "emotion, actually contributing to the feeling itself."
A emotion, actually also is contributing to the feeling itself
B emotion but also actually contributing to the feeling itself
C emotion but also actually contribute to the feeling itself
D emotion, they also actually contribute to the feeling of it
In a certain period difference between visible and invisible import and export of a country is called.
A Balance of payment
B Balance of trade
C Net trade
D imbalanced trade
Often visible as smog , ozone is formed in the atmosphere form" hydrocarbons and nitrogen oxides , two major pollutants emitted by automobiles react with sunlight .
A ozone is formed in the atmosphere from
B ozone is formed in the atmosphere when
C ozone is formed in the atmosphere when
D ozone is formed in the atmosphere ,and when

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