All sources of energy such as sun, electric bulb , heater etc. emit en

1.	All sources of energy such as sun, electric bulb , heater etc. emit energy which travels in the form of waves called electromagnetic wave because they are associated with electric and magnetic fields. Depending upon the nature of the source, we have different types of electromagnetic waves such as microwaves, radiowaves, X-rays, У-rays, cosmic rays etc differing from each other their wavelength or frequency. Now, answer the following question : (i) Should microwave oven be used for heating or cooking the food at home? Comment with points in favour and against. (ii) Why is it advised not to keep your cellphone in the breast pocket of your shirt? (iii) Why a person should go for minimum X-rays and a pregnant woman should not go for X-rays at all? (iv) Give one important application of ultrasound waves in medical field. How is it being misused in medical field ?
Answer» (i) Microwaves are high energy electromagnetic waves. It is believe that they agitate the molecules to move faster and faster. It destroys vitamins, minerals and protein. It changes them into products which may cause cancer, memory loss and decrease in intelligence.However, it is believed that a limited use has no harmful effects. In a modern fast life, it saves a lot of time and is a clean method of warming the food. (ii) It is believed that microwaves or radio waves of cellophane could interact with our heart. This problem is more serious for people using cardiac pace makers. Hence it is advised not to keep cell phone in breast pocket. (iii) X-ray is a type of high energy radiation. This can be destructive to all living cells and can cause DNA damage and mutation. They have bad effects on pregnancy and child birth. They can deform the body of infant and could be fatal to his life. They can harm the tissues of the bones called ―bone marrow‘‘ .Thus, there can be congenital disorders (birth defects). (iv) Ultrasound waves are high frequency sound waves. They are used to treat pain conditions and promote tissue healing in physiotherapy. The ultrasound machine is also used in the medical field to follow the growth of baby in the womb of the pregnant women. However, it is being misused to know the sex of the unborn baby.

All sources of energy such as sun, electric bulb , heater etc. emit energy which travels in the form of waves called electromagnetic wave because they are associated with electric and magnetic fields. Depending upon the nature of the source, we have different types of electromagnetic waves such as microwaves, radiowaves, X-rays, У-rays, cosmic rays etc differing from each other their wavelength or frequency. Now, answer the following question : (i) Should microwave oven be used for heating or cooking the food at home? Comment with points in favour and against. (ii) Why is it advised not to keep your cellphone in the breast pocket of your shirt? (iii) Why a person should go for minimum X-rays and a pregnant woman should not go for X-rays at all? (iv) Give one important application of ultrasound waves in medical field. How is it being misused in medical field ?

Answer»

(i) Microwaves are high energy electromagnetic waves. It is believe that they agitate the molecules to move faster and faster. It destroys vitamins, minerals and protein. It changes them into products which may cause cancer, memory loss and decrease in intelligence.However, it is believed that a limited use has no harmful effects. In a modern fast life, it saves a lot of time and is a clean method of warming the food.

(ii) It is believed that microwaves or radio waves of cellophane could interact with our heart. This problem is more serious for people using cardiac pace makers. Hence it is advised not to keep cell phone in breast pocket.

(iii) X-ray is a type of high energy radiation. This can be destructive to all living cells and can cause DNA damage and mutation. They have bad effects on pregnancy and child birth. They can deform the body of infant and could be fatal to his life. They can harm the tissues of the bones called ―bone marrow‘‘ .Thus, there can be congenital disorders (birth defects).

(iv) Ultrasound waves are high frequency sound waves. They are used to treat pain conditions and promote tissue healing in physiotherapy. The ultrasound machine is also used in the medical field to follow the growth of baby in the womb of the pregnant women. However, it is being misused to know the sex of the unborn baby.

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