11/17 8th Science Spiral Review

Match the following

• Has the longest wavelengths and the lowest frequency

• UV rays

• It is used in thermal imaging

• Radio waves

• Used in cell phone communication and police radar systems

• Microwaves

• Overexposure to this can result in sunburns and skin cancer

• Infrared rays

• Has the highest energy of all electromagnetic radiation and is the most damaging to human tissue

• Gamma Rays

How do these waves compare?

• wave 2 has a higher frequency than wave 4

• all have the same frequency

• all have the same wavelength

• wave 3 has a longer wavelength than wave 4

A person would weigh less on on the Moon than on the Earth because . . .

• Moon has more mass, and therefore more gravity
• Moon has less mass, and therefore more gravity
• Moon has more mass, and therefore less gravity
• Moon has less mass and therefore less gravity

  Which of these actions will increase the strength of the magnetic field produced around an electromagnet?

• Connect the wire to a device such as a light bulb
•   Disconnect the wire from the energy source
•   Increase the number of coils of the wire around the iron core
• A.  Wrap the wire around a piece of wood

When a student runs and kicks a ball, they have applied an ___________ force to move the ball.

• Balanced

• Magnetic

• Spring

• Unbalanced

The area of magnetic force around a magnet is known as its _____________.

• magnetic field

• magnetic declination

• magnetic fan lines

• magnetic tan lines

Tides are caused by

• strong winds that blow over ocean waters.

• the gravity of the moon and sun interacting with Earth.

• the shifting of the tectonic plates on the ocean floor.

• variations in the salinity of ocean water.

Which body has the greater effect on Earth's tides?

• Sun

• Mars

• Moon

• Mercury

Why does the moon's gravitational pull have more of effect on tides than the sun's gravitational pull?

• they are the same
• the moon is larger than the sun
• tides are not caused by the moon
• the moon is closer to the Earth than the sun

What type of tides would this arrangement of earth-moon-sun create?

• neap tide
• spring tide
• new moon tide
• full moon tide