In a plane wave, the wavefronts are
a. circular.
b. flat.
c. parallel.
d. perpendicular to the direction of propagation.
b, c, d
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I observe a galaxy that is 100 million light years away. Which of the following do I see?
A) the light from the galaxy as it is today, and it is redshifted B) the light from the galaxy as it was 100 million years ago, and it is redshifted C) the light from the galaxy as it is today, and it is blueshifted D) the light from the galaxy as it was 100 million years ago, and it is blueshifted E) Nothing: the galaxy lies beyond the cosmological horizon.
If 50 g of material at 100°C is mixed with 100 g of water at 0°C, the final temperature is 40°C. What is the specific heat of the material?
A) 0.33 kcal/kg ? °C B) 0.75 kcal/kg ? °C C) 1.33 kcal/kg ? °C D) 7.5 kcal/kg ? °C E) 33 kcal/kg ? °C
A. +x direction B. -x direction C. +y direction D. -y direction E. +z direction F. -z direction T. The field is zero.
According to de Broglie, as the momentum of a moving particle is quartered, the corresponding wavelength changes by what factor?
a. 1/4 c. 16 b. 1/16 d. 4