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
The transverse, longitudinal and surface waves in an earthquake originate from ________
A The focus within the body of the earth
B The focus on the surface of the earth
C The epicentre on the surface of the earth
D The epicentre within the body of the earth
Tsunami waves are the undersea occurrence of earthquake exceeding 7.5 on Richter scale. Which one of the following statements regarding this is not correct?
A It often generates strong waves
B The pacific coasts are most vulnerable to Tsunami waves.
C Tsunami waves are also called high-energy tidal waves or seismic sea waves.
D Tsunami is a Latin word.
The longitudinal, transverse and surface waves in an earthquake originate from
A The focus within the body of the earth
B The epicentre on the surface of the earth
C The focus on the surface of the earth
D The epicentre within the body of the earth
In which instrument earthquake is recorded? ( কোন যন্ত্রে ভূমিকম্প রেকর্ড করা হয়?)
A Earthquake recorder
B Seismograph
C Richter Scale
D Radar
The instrument to measure the magnitude of Earthquake is called
A Ideograph
B Pantograph
C Argograph
D Seismograph
(Make a meaningful sentence using the following jumble) Over the next two years they- P. turning the recording studio into Q. made their most groundbreaking work, R. of its own S. a magical instrument
A QPSR
B PQSR
C PQRS
D QPRS
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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