Which of the following statements about Em waves is true?

A. Em waves all have the same speed

B. Em waves all have the same wavelength

C. Em waves only travel through water

D. Em waves all have the same amount of energy

A chocolate wrapper is 6.7 cm long and 5.4 cm wide. Calculate its area up to reasonable number of significant figures.

Which heavenly bodies are involved in causing the earths tides? A. only the moon and earth. B. only the earth. C. the earth, moon, and sun. D. all the planets plus the moon.

Electrical energy can be transformed into other types of energy. We often experience this transformation of energy in our everyday lives. Which example represents a conversion from light energy to electrical energy? A) A B) B C) C D) D

This is a microscopic view of paper. What type of reflection occurs when light strikes paper? Justify your answer.

A bar of soap (mass 0.1 kg) is sliding at 1.5 m/s, before smashing into a motionless bar of soap (mass 0.08 kg). After hitting each other, the soap sticks together and continues to slid. Ignore friction.

A major obstacle to developing good human relations is that

4.) An apartment building is on fire and a guy is trapped on the fire escape ladder. There is a dumpster that is 6.3m away and is filled full of trash, and he is 7m above it.

Calculate the temperature of and power-per-area radiated from a blackbody if the spectral intensity density peaks at (a) gamma rays, λ = 1.50*10-14 m; (b) x rays, 1.50 nm; (c) red light, 640 nm; (d) broadcast television waves, 1.

How has increased energy use associated with scientific advancements affected society? a. It has led to an increase of the concentration of atmospheric carbon dioxide. b. It has led to an increase in hazardous wastes from mining operations. c.

Water is moving with a speed of 5.7 m/s through a pipe with a cross-sectional area of 4.8 cm2. The water gradually descends 9.2 m as the pipe increases to 8.8 cm2. (a) What is the speed at the lower level? (b) If the pressure at the upper level is 1.