Related Questions

When a wave strikes a vertical breakwater in deep water, it is reflected back and on meeting another advancing wave of similar amplitude merges and rises vertically in a wall of water. This phenomenon is called
A Surf
B Clapotis
C Fetch
D Swell
When a wave is incident from the more dense into a less dense medium at an angle equal to or exceeding the critical angle, the wave suffers total internal __________ .
A Reflection
B Refraction
C Transmission
D None of the above
শূন্য মাধ্যমে আলোর বেগ C পানি ও হীরকের প্রতিসরাঙ্ক যথাক্রমে 1.33 ও 2.66 হলে পানিতে আলোর (Velocity of light in free space is c. Refractive indices of water and diamond 1.33 and 2.66 respectively. The velocity of light in water is)
A 1.33 c
B 1.33c/2.66
C c / 1.33
D c/2.66
The portion of incident radiation (energy) without heating that surface reflected back from a surface of a body is called:
A Streto
B Ironodo
C Albedo
D Thermedo
In a perfect conductor the incident and reflected wave combine to produce
A A stronger incident wave
B A stronger reflected wave
C A standing wave which is not progressing
D None of the above
Two men and women are entrusted with a task. The second man needs three hours more to cope up with the job than the second man and the woman would need working together. The first man, working alone, would need as much time as second man and the woman working together. The first man working alone, would spend eight hours less than the double period of the time second man would spend working alone. How much time would the two men and the women need to complete the task if they all asked together?
A 1 hour
B 2 hours
C 3 hours
D 4 hours
E 5 hours
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%
When the phase velocity of an EM wave depends on frequency in any medium the phenomenon is called
A Scattering
B Polarisation
C Absorption
D Dispersion
A person can travel from Dhaka to Faridpur in 5 different ways and then come back in any of these ways. How many different routes are possible for him to go to Faridpur and come back?
A 10
B 9
C 25
D 20
Which of the following medium has the lowest refractive index?
A Petrol
B Oil
C Air
D Diamond

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