Assume the amplitude of the electric field in a plane electromagnetic wave is E1 and the amplitude of the magnetic field is B1. The source of the wave is then adjusted so that the amplitude of the electric field doubles to become 2E1. What happens to the intensity of the wave?
1.It becomes four times larger.
2.It becomes two times larger.
3.It can stay constant.
4.It becomes one-half as large.
5.It becomes one-fourth as large.
1
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If a barbell weighs 10 pounds on the Moon, what would it weigh on Earth?
A. 30 pounds. Surface gravity on Earth is 3 times that on the Moon. B. 10 pounds. Gravity is the same on Earth and the Moon. C. 60 pounds. Surface gravity on Earth is 6 times that on the Moon. D. 1.67 pounds. Surface gravity on the Moon is 1/6 that on Earth.
A 24.0-L tank contains ideal helium gas at 27°C and a pressure of 22.0 atm. How many moles of gas are in the tank? (R = 8.31 J/mol ? K, 1 atm = 101 kPa)
A) 238 mol B) 138 mol C) 17.5 mol D) 21.4 mol E) 76.0 mol
The energy released when an unstable electron state decays has an uncertainty of about 0.50 eV
What is the uncertainty in the life-time of the level? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 1.3 × 10-11 s B) 1.3 × 10-15 s C) 8.3 × 10-11 s D) 8.3 × 10-15 s
In the Northern Hemisphere, cyclones rotate ________; whereas an anticyclone rotates ________
A) counterclockwise around a low pressure center; clockwise around a high pressure center B) clockwise around a low pressure center; counterclockwise around a high pressure center C) counterclockwise around a high pressure center; clockwise around a low pressure center