Question

(a) Define heat. [2]
(b) What do you mean by global warming? [2]
(c) A ray of light is incident normally on a plane mirror.
(i) What is its angle of incidence?
(ii) What is the direction of reflected ray?​

Answer 1

a.Heat is the form of energy that is transferred between systems or objects with different temperatures (flowing from the high-temperature system to the low-temperature system). Also referred to as heat energy or thermal energy. Heat is typically measured in Btu, calories or joules.

(b).Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere.

(c).When light ray is incident on plane mirror it undergoes reflection. When the light ray is incident normally on the plane mirror then by using laws of reflection angle of incidence is equal to angle of reflection. ... Thus, reflected ray will reflect back in same path as that of incident ray.

Answer 2

Answer:

ᴛʜᴇ ᴀɴsᴡᴇʀ ɪs .....

ᴡʜᴀᴛ ɪs ʜᴇᴀᴛ?

ᴀɴs: ʜᴇᴀᴛ ɪs ᴛʜᴇ ᴛʜɪɴɢ ᴛʜᴀᴛ ғᴇᴇʟs ᴜs ʜᴏᴛ!!

ᴇɢ:: sᴜɴ ʜᴇᴀᴛ

ᴡʜᴀᴛ ɪs ɢʟᴏʙᴀʟ ᴡᴀʀɴɪɴɢ?

ᴀɴs:: ɢʟᴏʙᴀʟ ᴡᴀʀɴɪɴɢ ɪs ᴀ sɪɢɴ ᴛʜᴀᴛ ᴛᴏ ʟᴇᴛ ᴇᴠᴇʀʏᴏɴᴇ ᴋɴᴏᴡ ᴡʜᴇᴛʜᴇʀ ᴛʜᴇʀᴇ ɪs ᴡʜᴇᴛʜᴇʀ ᴄʜᴀɴɢᴇs ᴀɴᴅ ᴄʟɪᴍᴀᴛᴇ ᴄʜᴀɴɢᴇs

ᴡʜᴀᴛ ɪs ᴀ ʀᴀʏ ᴏʀ ʟɪɢʜᴛ. ɪs ɪɴᴄɪᴅᴇɴᴛ ɴᴏʀᴍᴀʟʟʏ ᴏɴ ᴀ ᴘʟᴀɴᴇ ᴍɪʀʀᴏʀ ?

ᴀɴs:: When light ray is incident on plane mirror it undergoes reflection. When the light ray is incident normally on the plane mirror ..

ᴡʜᴀᴛ ɪs ɪᴛs ᴀɴɢʟᴇ ᴏғ ɪɴᴄɪᴅᴇɴᴄᴇ ?

ᴀɴsᴡᴇʀ :: In geometric optics, the angle of incidence is the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence, called the ᴀɴɢʟᴇ ᴏғ ɪɴᴄɪᴅᴇɴᴄᴇ

ᴡʜᴀᴛ ɪs ᴛʜᴇ ᴅɪʀᴇᴄᴛɪᴏɴ ᴏғ ʀᴇʟᴇᴄᴛɪᴏɴ ʀᴀʏ ?

ᴀɴs:: ᴛʜᴇ ᴅɪʀᴇᴄᴛɪᴏɴ ɪs ᴡᴇsᴛ ...

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