Related Questions

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
Operation Search LIght is:
A code name for us attack in Iraq
B code name for Pakistan Army attack on 25th March 1971
C code name for counter attack of freedom fighters in 1971
D code name for Israel's attack Palestine
Fill in the blank : I am writing to request that Google----web search censorship based on point of view. An unidentified Google spokesman has indicated that google may alter its search algorithms so as to, in effect, censor the views of the so called climate.
A extant
B repudiate
C foible
D pertain
Is an artificial being created by operation of law, having the right of succession and the process, attributes and properties expressly authorized by the law or incident to its existence.
A Corporation
B Property
C Partnership
D Organization
The green light only ever goes on when tank A is full and tank C isn't empty. The red light is always on unless either tank A isn't Full or tank B is empty. Given that the green light is on, we can conclude all of the following EXCEPT---
A Tank A cannot be empty
B The red light must be on
C Tank C cannot be empty
D we don't have enough information to determine whether tank B is empty or not
The surface of a certain planet reflects 80 percent of the light that strikes it. The clouds around the planet then absorb 40 percent of the reflected light. What percent of the light that strikes the planet is reflected from the surface and passes through the clouds without being absorbed?
A 32%
B 40%
C 48%
D 60%
Diamonds are glittering and attractive because light incident on them undergoes
A Highest refraction
B Multiple internal reflections
C Multiple surface reflections
D Hundred percent transmission
The photo-electric effect occurs only when the incident light has more than a certain critical
A Intensity
B Speed
C Frequency
D Wave length
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
The method that performs the search-and-replace operation to strings for pattern matching is
A searchandreplace()
B add()
C edit()
D replace()

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