Related Questions

দেওয়া আছে (i) অর্ধপরিবাহীর Majority carrier election, (ii) p-type অর্ধপরিাবাহীর Majority carrier hole এবং (iii) pure অর্ধপিরবাহীর Majority carrier hole । নিচের কোনটি সঠিক?
A i ও ii
B ii ও iii
C i ও iii
D i, ii, ও iii
দুটি সুসঙ্গত উৎস থেকে λ দৈর্ঘ্যের দুটি তরঙ্গ সমদশায় বের হয় । একটি বিন্দুতে যেখানে তরঙ্গ দুটি মিলিত হয় সেখানে তাদের দশা পার্থক্য 90° । তরঙ্গ দুটির অতিক্রান্ত পথ পার্থক্য তখন কত ? ( Two coherent sources emit waves of wavelength λ which are in phase. which are in phase. The two waves meet at a point where they have a phase difference of 90°. Which of the following could be the traversed path difference between the waves?)
A 2λ
B λ
C λ/2
D λ/4
The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, $$l$$ = Original length of the body, A = Cross-sectional area of the body and E = Young's modulus for the material of the body)
A $$\frac{{{\text{P}}l{\text{A}}}}{{\text{E}}}$$
B $$\frac{{{\text{P}}l}}{{{\text{AE}}}}$$
C $$\frac{{\text{E}}}{{{\text{P}}l{\text{A}}}}$$
D $$\frac{{{\text{AE}}}}{{{\text{P}}l}}$$
Which one of the following is not a property of electromagnetic waves?
A Electromagnetic waves do not show interference and diffraction.
B Oscillating electric field and magnetic field are perpendicular to each other.
C Electromagnetic waves are transverse waves
D Electromagnetic waves do not require a medium to propagate.
Coherence of two electromagnetic waves takes place if their phase difference is:
A Constant in time
B Constant in space
C Constant in time and space
D None of these
The scientist who first sent electromagnetic waves to distant places is
A James Clerk Maxwell
B Heinrich Hertz
C Thomas Alva Edison
D John Logie Baird
নিচের কোন তড়িৎ চৌম্বকীয় তরঙ্গের কম্পাঙ্ক সর্বোচ্চ? (Which one of the following electromagnetic waves has the highest frequency?)
A এক্সরে রশ্মি (X-ray)
B গামা রশ্মি (Gamma ray)
C অতিবেগুনি রশ্মি (Ultraviolet ray)
D অবলোহিত রশ্মি (Infrared ray)
The radiation emitted by a black body is known as
A Black radiation
B Full radiation
C Total radiation
D All of these
Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.
A Grey
B Black
C Opaque
D White
Wavelength of radiation emitted by a body depends on the __________ of its surface.
A Temperature
B Area
C Nature
D All of the above

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