Related Questions

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
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 majority of electromagnetic waves emitted by the human body--
A are above 760 millimicrons in length
B vary between 380 and 760 millimicrons in length
C translate into thermographic techniques
D are below 3890 millimicrons in length
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
Which of the following statements is correct about sound waves and light waves?
A Both transverse waves
B Both longitudinal waves
C Sound waves are transverse waves and light waves are longitudinal waves
D Sound waves are longitudinal and light waves are transverse waves
The higher the wind speed and the longer the fetch or distance of open water across which the wind blows and waves travel, the ____ waves and the ____ energy they process.
A larger, more
B larger, less
C smaller, more
D smaller, less
Why does the ionosphere of the Earth's atmosphere facilitate radio communication? i. The presence of ozone causes the reflection of radio waves to earth ii. Radio waves have a very long wavelength
A i only
B ii only
C both i & ii
D neither i nor ii
Sound waves are ------ waves.
A transverse
B Electromagnetic
C Longitudinal
D one of these
sounds waves are -- waves
A transverse
B Electromagnetic
C Longitudinal
D none of these

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