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
Two waves of the same frequency have opposite phase when the phase angle between them is
A 360°
B 180°
C 90°
D 0°
An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then
A VR = VL
B VL
C VL = VR
D VL > VR
A capacitor and a resistor are connected in series to a sine wave generator. The frequency is set so that the capacitive reactance is equal to the resistance and, thus, an equal amount of voltage appears across each component. If the frequency is increased
A VR > VC
B VC > VR
C VR = VC
D VR and VC = 0
If the design speed is V kmph and deviation angle is N radians, then the total length of a valley curve in meters is given by the expression
A $$3.8{\text{ N}}{{\text{V}}^{\frac{1}{2}}}$$
B $$3.8{\left( {{\text{N}}{{\text{V}}^3}} \right)^{\frac{1}{2}}}$$
C $$0.38{\left( {{\text{N}}{{\text{V}}^3}} \right)^{\frac{1}{2}}}$$
D $$0.38{\text{ N}}{{\text{V}}^{\frac{3}{2}}}$$
What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value?
A 0°
B 45°
C 90°
D 180°
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
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
The period of a sine wave is ___________ seconds. Its frequency is
A 20 Hz
B 30 Hz
C 40 Hz
D 50 Hz
A sine wave voltage is applied across a capacitor. When the frequency of the voltage is decreased, the current
A Increases
B Remains constant
C Decreases
D Ceases

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