Examlex
The greenhouse effect occurs because carbon dioxide in the atmosphere absorbs ultraviolet radiation.
Syphilis
A bacterial infection usually spread by sexual contact that starts as a painless sore.
Trimester
A trimester is a period of approximately three months, particularly used to divide the nine months of pregnancy into three stages for the purpose of medical and prenatal care.
Stillborn
Refers to a baby who is born dead after 24 completed weeks of pregnancy.
HIV
Human Immunodeficiency Virus, a virus that attacks the immune system, and without treatment, can lead to AIDS (Acquired Immunodeficiency Syndrome).
Q1: An electrostatic precipitator uses an electric field
Q5: A source emits sound at a fixed
Q18: A wood stove in the corner of
Q21: A laser emits monochromatic and coherent light.
Q41: Electrons in atoms<br>A) orbit the nucleus in
Q51: When a nucleus in an excited state
Q67: The figure shows a 'snapshot' of four
Q68: A battery supplies<br>A) AC current.<br>B) DC current.<br>C)
Q85: The number of cycles of a wave
Q106: Which of the following devices use lasers?<br>A)